ASME/IEEE RVTIS
Abbreviations/Definitions Version 19
ABBREV. Abbreviations
Description meaning of the abbreviation
TRB indicates
if the abbreviation appears in the TRB Glossary
Usage indicates
the draft standard using the abbreviation
ABBREV. |
DESCRIPTION |
TRB
|
USAGE
|
AAR |
Association of American
Railroads |
N |
1570 |
AASHTO |
American Association of
State Highway and Transportation Officials |
N |
1570 |
ACSES |
advanced civil speed
enforcement system |
N |
1482/1482.1 |
AGT |
automated guideway transit |
Y |
1475 |
Ah |
Ampere hour |
N |
1536 |
ANSI |
American National Standards
Institute |
N |
1473/14h76/1536 |
API |
applications interface |
N |
1473 |
APTA |
American Public
Transportation Association (formerly American Public Transit Association) |
N |
1474.1/1536 |
AREMA |
American Railway Engineering
and Maintenance of Way Association |
N |
1478/1570 |
ASCE |
American Society of Civil
Engineers |
N |
1483/1478/1474.1 |
ASTM |
American Society for
Testing and Materials |
N |
1478/1536 |
ATC |
automatic train control |
Y |
1475/1474.1/1474.2/1482 1482.1 |
ATO |
automatic train operation |
Y |
1475/1474.1/1474.2/1482 |
ATP |
automatic train protection |
Y |
1475/1474.1/1483/1474.2 1482.1 |
ATPM |
automatic train protection
manual |
N |
Not Used |
ATS |
automatic train speed |
N |
1482/1482.1 |
ATS |
automatic train stop;
automatic train supervision |
Y |
1475/1474.1/1474.2 |
AWG |
American Wire Gauge |
N |
1473 |
AWS |
auxiliary wayside system |
N |
Not Used |
BC |
battery charger |
N |
1476 |
CBTC |
communications-based train
control |
N |
1474.1/1474.2/1482 1482.1 |
CENELEC |
European Committee for
Electrotechnical Standardization |
N |
1483 |
CFR |
Code of Federal Regulations |
N |
1482/1482.1 |
DMU |
diesel multiple unit |
Y |
1475 |
DOT |
United States Department of
Transportation |
Y |
1476/1536 |
EIA |
Electronics Industry
Association |
N |
1473 |
EMC |
electo magnetic
compatibility |
N |
1536 |
EMI |
electro magnetic interference |
N |
1476/1478 |
EMU |
electric multiple unit |
N |
1475 |
FFT |
functional fault tree |
N |
1483 |
FMEA |
failure modes and effect
analysis |
N |
1483 |
FRA |
Federal Railroad
Administration (of the DOT) |
Y |
1476/1482/1482.1/1536 |
FTA |
Federal Transit
Administration (of the DOT) |
N |
1476/1536 |
FTA |
fault tree analysis |
N |
1483 |
GPS |
global positioning system |
N |
1482.1 |
GUI |
graphical user interface |
N |
1474.2 |
HEP |
head end power |
N |
Not Used |
HRV |
heavy rail vehicle |
N |
1475 |
HVAC |
heating, ventilating and
air conditioning |
N |
1476 |
IEC |
International
Electrotechnical Commission |
N |
1473/1478/1483/1536 |
IEEE |
Institute of Electrical and
Electronics Engineers |
N |
1474.1/1476/1474.2 1478/1482.1/1483/1570/1536 |
ISO |
International Standards
Organization |
N |
1483 |
ITE |
Institute of Transportation
Engineers |
N |
1473/1570 |
ITS |
intelligent transportation
system |
N |
1482.1/1482 |
IVPS |
intermediate voltage power
supply |
N |
1476 |
LCD |
liquid crystal display |
N |
1477/1475 |
LED |
light emitting diode |
N |
1477/1475/1482.1 |
LSB |
local sensor bus |
N |
1473 |
LRV |
light rail vehicle |
Y |
1475 |
LVB |
local vehicle bus |
N |
1473 |
LVPS |
low voltage power supply |
N |
1476/1536 |
MDS |
monitoring and diagnostic
system |
N |
1482.1/1482 |
ML |
multi-function-vehicle bus
to local sensor bus |
N |
1473 |
MTBE |
mean time between event |
N |
Not Used |
MTBF |
mean time between failure |
N |
1474.1 |
MTBFF |
mean time between
functional failure |
N |
1474.1 |
MTBHE |
mean time between hazardous
event |
N |
1474.1/1483 |
MTTR |
mean time to repair |
N |
1474.1 |
MTTRS |
man time to restore service |
N |
1474.1 |
MVB |
multi-functional vehicle
bus |
N |
1473 |
NEC |
National Electrical Code
(also known as NFPA 70) |
N |
1476/1536 |
NEMA |
National Electrical
Manufacturers Association |
N |
1476/1536/1570 |
NFPA |
National Fire Prevention
Association |
N |
1476/1536 |
NMT |
network management |
N |
Not Used |
NOAA |
National Oceanic and
Atmospheric Administration |
N |
1478 |
NTCIP |
national transportation
communications for intelligent transportation system (ITS) protocol |
N |
1570 |
O&SPA |
operational and support
hazard analysis |
N |
Not Used |
OSI |
open system interconnect |
N |
1473 |
PCMCIA |
Personal Computer Memory
Card International Association |
N |
1477 |
PD |
process data |
N |
1473 |
PHA |
preliminary hazard analysis |
N |
1483 |
PV |
presentation variables |
N |
1473 |
PWM |
pulse width modulation |
N |
1475 |
RF |
radio frequency |
N |
1474.1 |
ROSIN |
railway open system
interconnection network |
N |
1473 |
RTP |
real time protocols |
N |
Not Used |
SAE |
Society of Automotive
Engineers |
N |
1478 |
SHA |
safety hazard analysis |
N |
Not Used |
SNVT |
standard network variable
type |
N |
1473 |
SSHA |
subsystem hazard analysis |
N |
1483 |
SSIHA |
subsystem interface hazard
analysis |
Y |
1483 |
SSn-FTA |
subsystem fault tree
analysis |
N |
1483 |
SSPP |
system safety program plan |
N |
1474.1 |
SVP |
safety verification plan |
N |
1483 |
TCN |
train communications
network |
N |
1473 |
TCRP |
Transportation Cooperative
Research Program |
N |
1473 |
TCS |
train control system |
N |
1477 |
TNM |
train network management |
N |
Not Used |
TRB |
Transportation Research
Board |
Y |
1475/1473/1536 |
UIC |
Union International des
Chemins de Fer |
N |
Not Used |
UL |
Underwriters Laboratory |
N |
1536 |
VOBC |
vehicle on-board (master)
control |
N |
1475 |
WTB |
wire train bus |
N |
1473 |
|
|
|
|
|
|
|
|
Word word being
defined
S status
of definition
A approved by ballot P published in a standard
Definition meaning for the word
TRB indicates
whether the word appears in the TRB Glossary
D
– different M – modified N – no Y - yes
Usage the
first reference indicates standard where word was first defined and/or
accepted. Usage within other standards
follows the first usage.
WORD |
S
|
DEFINITION
|
TRB
|
USAGE
|
actual weight |
P |
The measured weight of a
finished, ready-to-run vehicle. Synonym: empty. |
N |
1475 |
adhesion (coefficient of) |
P |
During
rolling contact, the ratio between the longitudinal tangential force at the
wheel-rail/running surface interface and the normal force. |
N |
1475 |
aging factor |
A |
A quantitative factor
expressing the degradation in the ability of the battery, due to usage, to
deliver electrical energy under specified conditions such as, but not limited
to, operating ambient temperature, cycling, depth of charge, and maintenance
practices. |
N |
1476 |
alertness function |
P |
A device or system which
monitors the operator for signs of incapacitation, usually by requiring
movement or response to take place within a prescribed period of time. |
N |
1475 |
ambient temperature |
A |
The ambient temperature is
the temperature at which a test chamber shall be maintained while testing the
equipment for verification of compliance with this standard. |
N |
1478 |
apparatus |
P |
A device or system of
devices that performs a distinct function within a basic operating unit,
including a device or system of devices whose principal function is data
communications. |
N |
1473 |
apparatus interoperability |
P |
The ability of any specific
apparatus to communicate with other apparatuses in such a way that it can
successfully replace another apparatus of the same apparatus type without any
requirement for manual configuration other than the address or unique
identifier of the replacement apparatus. |
N |
1473 |
apparatus type |
P |
A pre-defined configuration
that, when adhered to by a given apparatus, makes it possible for that
apparatus to achieve apparatus interoperability, without restriction on the
internal constructional details of the apparatus concerned. |
N |
1473 |
authority |
P |
A geographical or political
division created specifically for the single purpose of providing
transportation service. |
Y |
1475 1476 1536 |
authority having jurisdiction |
P |
That entity that defines
the contractual (including specification) requirements for the procurement. |
N |
1475 1473 1474.1 1476 1474.2 1478 1536 1570 |
automated guideway transit |
P |
Any guided transit mode
with fully automated operation (i.e. no crew on the train). The term usually refers, however, only to
guided modes with small and medium-sized vehicles that operate on exclusive
right-of-way. |
Y |
1475 |
automatic train control |
P |
The system for
automatically controlling train movement, enforcing train safety, and
directing train operations. ATC must
include automatic train protection (ATP) and may include automatic train
operation (ATO) and/or automatic train supervision (ATS). |
M |
1475 1474.1 1474.2 |
automatic train operation |
P |
That subsystem within the
automatic train control system which performs any or all of the functions of
speed regulation, programmed stopping, door control, performance level
regulation or other functions otherwise assigned to the train operator. |
M |
1475 1474.1 1474.2 |
automatic train protection |
P |
That subsystem within the
automatic train control system which maintains fail-safe protection against
collisions, excessive speed, and other hazardous conditions through a
combination of train detection, train separation, and interlocking. |
M |
1475 1474.1 1474.2 |
automatic train stop |
P |
A wayside system that works
in conjunction with equipment installed on the vehicle to apply the brakes at
designated restrictions or on a dispatcher’s signal, should the operator not
respond properly. |
M |
1475 |
automatic train supervision |
P |
That subsystem within the
automatic train control system which monitors trains, adjusts the performance
of individual trains to maintain schedules, and provides data to adjust
service to minimize the inconveniences otherwise caused by irregularities. Note - The ATS subsystem
also typically includes automatic routing functions. |
Y |
1475 1474.1 1474.2 |
auxiliary wayside system |
P |
A back-up or secondary
train control system, capable of providing full or partial automatic train
protection for trains not equipped with trainborne communication-based train
control (CBTC) equipment, and/or trains with partially or totally inoperative
trainborne CBTC equipment. The
auxiliary wayside system includes trainborne equipment and may also provide
broken rail detection. |
N |
1474.1 |
basic operating unit |
P |
(A) A single vehicle designed for independent operation. (B) A permanent or semi-permanent combination, designed
for independent operation, consisting of two or more vehicles of one or more
types. |
D |
1475 1473 1474.1 1477 |
battery tray |
|
The supporting structure
that allows two or more individual cells, or one or more multi-cell units to
be mechanically configured as one assembly. |
N |
1536 |
battery voltage |
A |
That voltage which is
provided within specified limits by the low voltage power supply (or, in its
absence, the control voltage on-board battery). Note-Battery voltage limits
are specified in IEEE P1476/D4.0. |
N |
1475 |
blending |
P |
The combination of two or
more modes of braking (e.g. rheostatic electric brake, regenerative electric
brake and friction brake) to produce the desired total retarding effort. |
N |
1475 |
block |
P |
See IEEE Dictionary |
M |
1475 |
bonding |
|
The establishment of a
low-impedance current path between two adjacent components through an
intimate interface surface. |
N |
16 |
brake, electric |
P |
See electric brake. |
|
|
brake, emergency |
P |
See emergency brake. |
|
|
brake, friction |
P |
See friction brake. |
|
|
brake, “panic” |
P |
See “panic” brake. |
|
|
brake, parking |
P |
See parking brake. |
|
|
brake, penalty |
P |
See penalty brake. |
|
|
brake, regenerative |
P |
See regenerative brake. |
|
|
brake, rheostatic |
P |
See rheostatic brake. |
|
|
brake, service (maximum) |
P |
See service brake
(maximum). |
|
|
brake, snow |
P |
See snow brake. |
|
|
brake, straight air |
P |
See straight air brake. |
|
|
brake, track |
P |
See track brake. |
|
|
brakes applied |
P |
An indication that all
friction brakes are applied to some agreed upon preset level. |
N |
1475 |
braking effort |
P |
That longitudinal retarding
force generated by the friction brake system or the propulsion system (in
electric brake). |
N |
1475 |
builder |
P |
The entity manufacturing
the product. |
N |
1475 1476 1536 |
cab signal (system) |
P |
A signal located in the
cab, indicating a condition affecting the movement of a train and used in
conjunction with interlocking signals and in conjunction with or in lieu of
block signals. |
Y |
1475 |
car |
P |
See vehicle. |
--- |
1475 1476 1474.1 1536 |
carbody |
|
The vehicle body comprising
its main load carrying structure above all suspension units. It includes all components that are
connected to this structure and contribute directly to the strength,
stiffness and stability. Mechanical
equipment and other mounted parts are not considered part of the carbody. |
N |
RT-1 |
car builder |
P |
The entity assembling or
manufacturing the vehicle. |
N |
1475 1476 1536 |
civil speed restriction |
P |
The maximum speed
authorized for each section of track, as determined primarily by the
alignment, profile, and structure. |
Y |
1474.1 |
closing speed |
|
Relative speed of vehicles
at instant of impact. |
N |
RT-1 |
coast |
P |
The mode of operation of a
vehicle or train in which both tractive effort from the propulsion system and
braking effort from the propulsion and friction brake systems are zero. NOTE–The inherent design
characteristics of some propulsion systems will require that a negligible
level of electric brake be present in the coast mode. |
N |
1475 |
cock |
P |
A pneumatic device having
two positions, closed/shut and open/through. |
N |
1475 |
communications-based train control |
P |
A continuous automatic
train control system utilizing: high-resolution train location determination,
independent of track circuits; continuous, high capacity, bi-directional
train-to-wayside data communications; and trainborne and wayside processors
capable of implementing vital functions. |
N |
1474.1 1474.2 |
communications-based train control user (CBTC user) |
|
Any authority-authorized
personnel who receives information from, provides information to, or performs
repair or maintenance on, a CBTC system. |
|
|
commuter rail |
P |
A passenger railroad
service that operates within metropolitan areas on trackage that usually is
part of the general railroad system.
The operations, primarily for commuters, are generally run as part of
a regional system that is publicly owned or by a railroad company as part of
its overall service. |
Y |
1474.1 |
concept level |
P |
The
level of verification activities at which vital functions and vital
implementation requirements, imposed on the system’s design and
implementation by the safety assurance concept selected, are determined and
identified. |
N |
1483 |
consist |
P |
The makeup or composition
(number and specific identity) of individuals units of a train. |
D |
1475 1477 1474.1 |
constant current loads |
A |
A load that demands
constant current even current when the input voltage varies. Note – Typical of such
loads is lighting when driven from an
inverter ballast configuration. |
N |
1476 |
constant power load |
A |
A load that demands a
constant power from the source even when the voltage value drops such as when
switching from the low voltage power supply to the battery. Note – Typical of such
loads that have their own built in regulator such as propulsion control
voltage supply. |
N |
1476 |
continuous train control system |
|
A locomotive or
self-propelled car apparatus that is constantly in contact with wayside control apparatus and is
immediately responsive to a change of conditions in the controlling section
that affects train movement. |
M |
Not Used |
controls |
|
An active processing of
commands or inputs, relaying a request to a subsystem for action. |
N |
1482 |
control action |
|
A request by the
communication based train control (CBTC) user for the CBTC system to perform
an operation. A control action may
require a single user input, or a sequence of user inputs, and a user
requested control action may be subject to verification checks prior to the
CBTC system performing the requested operation. |
N |
1472.2 |
control voltage |
P |
Voltage that is provided
for operating the controlling elements of the train. See: battery voltage. NOTE-This may or may not be
the same potential value as the battery voltage. |
N |
1475 |
coupler interface |
P |
That facility of an basic
operating unit that is designed to provide convenient connection to, and
disconnection from, any other basic operating unit without requiring
disassembly of any constituent part of either basic operating unit. This includes standardized mechanical,
electrical, electronic, pneumatic, and other interfaces as required. |
N |
1473 |
crashworthiness |
|
The ability of a vehicle to
manage the energy of a collision. |
|
RT-1 |
corona effect |
|
A type of localized
discharge resulting from transient gaseous ionization in an insulation
system, when the voltage exceeds a critical value. The ionization is usually localized over a portion of the
distance between the electrodes of the system. |
N |
16 |
creepage |
|
The shortest distance
between two conducting parts measured along the surface or joints of the
insulating material between them. |
N |
16 |
crush load vehicle loads (AW3) |
|
AW1 plus 6 passengers per m2
(5 passengers per yd2) in standing areas, and train operator on
board. |
N |
RT-1 |
crush loaded weight |
P |
The weight of a vehicle
when loaded with crew, all seats occupied, and standees to a specified
number. |
N |
1475 |
cut out |
P |
The state of being disabled
by the conscious use of a cutout device or function. |
N |
1475 |
cutout |
P |
A device or function whose
purpose is deliberately to disable a specified device or function, e.g.
“dynamic brake cutout.” |
N |
1475 |
data recorder |
P |
The device used to record
any type of data |
N |
1475 |
data recording |
P |
The act of to recording any
type of data. |
N |
1475 |
deadman |
P |
A pressure or activity
actuated alertness device to detect inattention or disability of a train
operator. NOTE-The deadman can be
contained within the master controller main handle grip, obtained by a
separate foot switch, or obtained through an alertness type function. The device, when not properly maintained
in an operational condition, will result in an emergency or full service
brake application. |
D |
1475 |
dead time |
P |
See IEEE Dictionary. |
N |
1475 |
derail detector |
P |
A device so arranged as to
detect a derailment condition. |
N |
1475 |
designer |
|
The contractor who has the
contractual responsibility to design, manufacture, test and certify ready for
service the vehicle to satisfy the system design criteria and the vehicle
specification of the Operator |
N |
RT-1 |
diagnostics |
|
The process of determining
the cause of a fault from symptoms. Active: Diagnostics
based on observed conditions and commanded test routines initiated by the
monitoring and diagnostic system. Passive:
Diagnostics based on observed conditions. |
N |
1482 |
display |
|
A visual representation of
data, graphics or text that is presented on a screen. |
N |
1474.2 |
display screen |
|
The surface of the display
device on which the visual representation of data is presented. |
N |
1472.2 |
doors closed |
P |
A state, as given by
trainline signal indication, in which doors are fully closed and locked. |
N |
1475 |
doors locked |
P |
The condition reached in
the door closing cycle when the drive has achieved a latching condition that
will hold doors closed mechanically until a door opening cycle is initiated. |
N |
1475 |
doors open |
P |
A state, as given by
trainline signal indication, in which doors are not fully closed and locked. |
N |
1475 |
dwell time |
P |
The time a transit unit
(vehicle or train) spends at a station or stop, measured as the interval
between its stopping and starting. |
Y |
1474.1 |
electric brake |
P |
A mode of operation of the
propulsion system in which retarding is provided. NOTE–Although generally
considered synonymous with dynamic brake, electric brake is a more global
term, in that it includes the possibility of providing retardation by drawing
power from the line or other means not dependent on conversion of kinetic
energy into retarding power, which is the key element of dynamic braking. |
D |
1475 |
electric coupler |
P |
A device used to allow
trainline signals to be transmitted from vehicle to vehicle or unit to unit
in a train, with the connection of trainlines performed automatically when
vehicles are coupled. |
D |
1475 |
emergency brake |
P |
Fail-safe, open-loop
braking to a complete stop with an assured maximum stopping distance
considering all relevant factors.
Once the brake application is initiated, it is irretrievable, i.e. it
cannot be released until the train has stopped or a predetermined time has
passed. |
M |
1475 1474.1 |
empty weight |
P |
See actual weight. |
|
|
end sill compression load (buff load) |
|
Compressive force applied
at the ends of the car, usually at the anticlimber. |
N |
RT-1 |
ergonomics |
|
The interdisplinary science
which studies the relationships between people and their environment. |
N |
1474.2 |
event recorder |
P |
An on-board device/system
with crashworthy nonvolatile memory which records data to support
accident/incident analysis. |
N |
1475 1482 1482.1 |
fade |
P |
(A) The condition occurring
during a braking cycle at low speed wherein the fundamental characteristics
of the propulsion system utilized will not support the power requirement of
the level of dynamic electric brake called for. Consequently, the level of dynamic electric brake actually
generated decreases as a function of speed along an inherent characteristic. |
N |
1475 |
failure |
|
Partial or complete loss of
component, subsystem or system capability, resulting in equipment being
unable to perform some or all of its intended function. Note: Failures can be major, where total loss of equipment
capability results, or minor, where
equipment remains operable but with reduced capability or where the failure
is resettable. Failures can occur in
equipment which is being observed by the M&D system, termed equipment failure, or in some element
of the M&D system itself, termed M&D
failure. M&D failures can be further divided into two categories: monitoring failures and diagnostic failures. Monitoring failures can be divided into FRA monitoring failures, where a
failure to record an FRA‑required parameter has occurred (where FRA
requirements apply) or, diagnostic
monitoring failures, where a failure to record a non‑FRA required
parameter has occurred. |
N |
1482 |
fail-safe |
P |
A design philosophy applied
to safety-critical systems such that the result of a hardware failure or the
effect of software error shall either prohibit the system from assuming or
maintaining an unsafe state, or shall cause the system to assume a state
known to be safe. |
Y |
1475 1474.1 1483 |
fail-safely |
P |
The
implementation of a function in a fail-safe manner. |
N |
1483 |
fault |
|
A status condition outside
normal or expected parameters. |
N |
1482 |
fault tree analysis (FTA) |
P |
A
structured analysis method used to comprehensively identify faults and combinations of faults of software and
hardware components as they relate to a hazard. |
N |
1483 |
forward |
P |
The direction of motion of
the train corresponding to the direction of vision of an operator or
attendant when occupying his or her normal position in a normal orientation. NOTE-For an unattended
vehicle, forward may be defined by the prevailing direction of operation on
the guideway segment being utilized. |
N |
1475 |
friction brake |
P |
The system of pneumatic,
electropneumatic, hydraulic, electrohydraulic, or electric valves, controls,
actuators and associated components which, in combination, provide the
capability of braking the car to a stop purely by the action of friction
devices upon the wheel tread, disc rotors, or other surfaces. |
D |
1475 |
full field |
P |
In a propulsion system, the
motor connection in which, for series motors, the exciting field current is
the same as the armature current, or, for separately excited motors, the
exciting field current is at its maximum value. |
N |
1475 |
fully seated load vehicle load (AW1) |
|
AWO
plus full-seated passenger load and the train operator on board. |
N |
RT-1 |
function key |
|
Assignable
special purpose keys on a computer keyboard or keypad, which CBTC user
employs to interact with the communications-based train control system. |
N |
1474.2 |
functional fault tree |
P |
A
structured fault tree analysis method used to identify vital functions at the
system functional level by comprehensively examining system functional
faults, which could precipitate hazards. |
N |
1483 |
functional level |
P |
The
level of verification activities at which vital system functions are
identified from system functional and operational requirements. |
N |
1483 |
galvanic isolation |
P |
A
method of electrical isolation where neither the signal nor the common of the
output of the isolator is dc coupled to the signal or common of the input of
the isolator, except for low level leakage associated with non-ideal
components. |
N |
1476 1482.2 |
gap |
|
The shortest distance
measured through air, between parts of different potential. |
N |
16 |
grounding |
|
The establishment of a
low-impedance circuit or path to a designated ground plane or location. |
N |
16 |
hardware failure |
P |
A
change in the characteristics of a system hardware element beyond its design
tolerances. |
N |
1483 |
hazard |
P |
An
existing or potential condition that can result in a mishap. |
N |
1483 1473 |
head end power |
|
Train-lined auxiliary power
provided from a locomotive to other cars in the train. |
N |
Not Used |
headway |
P |
The time interval between
the passing of the front ends of successive vehicles or trains moving along
the same lane or track in the same direction. |
Y |
1474.1 |
health |
P |
Summary information
regarding the current ability of a system or subsystem to perform its
intended function. |
N |
1482.1 1482 |
heating ventilation and air conditioning (HVAC)
compressor pull down |
A |
The
condition wherein the air conditioning system in the car is turned on and is
required to cool a car that has been sitting in the heat of the day. NOTE
– This condition usually presents the highest/longest sustained power demands
to the auxiliary inverter. |
N |
1476 |
heavy rail transit |
P |
A mode of rail rapid
transit generally characterized by fully grade-separated construction,
operating on exclusive rights of way, and station platforms at the floor
level of the vehicles. |
D |
1475 1474.1 1476 |
heavy rail vehicle |
P |
A vehicle operating on a
heavy rail transit system. Typically,
electrically propelled, bi-directional, capable of operating in multiple
unit, and designed for rapid, high-level boarding and discharging of
passengers. |
N |
1475 1476 |
high discharge rate (H) |
|
Typically
for discharges above 3.5C5A up to 7C5A in accordance
with IEC 60623. |
N |
1536 |
human computer interface |
|
The
set of stimuli that a user experiences when in and around a computer terminal
including but not limited to a user interface, the work area furnishings and
environmental elements consisting of bio-mechanical stresses, light, sound,
temperature, and air quality. |
N |
1474.2 |
implementation level |
P |
The
level of verification at which system components implementing vital functions
are comprehensively identified and analyzed to verify that all functions
identified as vital are implemented fail-safely. |
N |
1483 |
independent operation |
P |
The ability, when supplied
with appropriate energy, and with control signals from internal sources or
through one or more coupler interfaces, to perform all of the functions of
which the installed equipment is intended to be capable. |
N |
1473 |
interface |
A |
The points where two or
more physical systems or subsystems meet to transfer energy or information. |
N |
1476 |
interlocking |
P |
An arrangement of switch,
lock and signal devices that is located where rail tracks cross, join,
separate, and so on. The devices are
interconnected in such a way that their movements must succeed each other in
a predefined order, thereby preventing opposing or conflicting train
movements. |
Y |
1474.1 |
intermediate voltage power supply (IVPS) |
A |
Power supply which converts
the third rail or catenary high voltage dc or ac into an intermediate voltage
dc or ac to feed other power
supplies. |
N |
1476 |
lay-up condition |
A |
Idle condition of the
equipment and systems between service operations. |
N |
1476 |
light-emitting diode |
P |
See IEEE Dictionary. |
N |
1477 |
light rail transit |
P |
A mode of rail transit
characterized by its ability to operate on exclusive rights-of-way, street
running, center reservation running, and grade crossings and to board and
discharge passengers at track or vehicle floor level. |
Y |
1475 1474.1 1476 |
light rail vehicle |
P |
A vehicle which operates on
a light rail transit system, capable of boarding and discharging passengers
at track or vehicle floor level. |
Y |
1475 1476 |
liquid crystal display |
P |
See IEEE Dictionary. |
N |
1477 |
load shedding |
P |
See IEEE Dictionary. |
N |
1476 |
load weighing |
P |
A function incorporated in
the propulsion or friction brake system which measures changes in sprung
vehicle weight. Its purpose is to
permit control of tractive effort in order to achieve a constant
effort-to-weight ratio for a given master control command. |
N |
1475 |
locked rotor current |
P |
See IEEE Dictionary. |
N |
1476 |
low discharge rate (L) |
|
Typically
for discharges up to 0.5C5A in accordance with IEC 60623. |
N |
1536 |
low voltage power supply (LVPS) |
A |
A power supply, which
provides dc power to the low voltage devices or circuits contained on the
vehicle. It can also be configured to
charge the vehicle battery. |
N |
1476 |
manufacturer |
A |
See: builder |
N |
1476 1536 |
master control |
P |
The trainborne device or
system directly providing the control signals to the train. |
N |
1475 1474.1 |
master controller |
P |
A physical device utilized
by a human operator to provide the master control of a train. |
N |
1475 |
mean time between hazardous events (MTBHE) |
P |
Where hazardous events and
the equipment, which may precipitate them are defined at the system
level. The hazardous events included
in MTBHE are those whose consequences are of a given severity, as determined
by the organization generating the safety goals. |
N |
1483 |
Medium discharge rate (M) |
|
Typically
for discharges above 0.5C5A up to 3.5C5A in accordance
with IEC 60623. |
N |
1536 |
mishap |
P |
An unplanned event or
series of events resulting in death, injury, occupational illness, or damage
to or loss of equipment or property, or damage to the environment; an
accident. |
N |
1483 |
monitoring |
|
The measurement of
parameters which are then available for storage, display and/or processing. |
N |
1482 |
movement authority |
P |
The authority for a train
to enter and travel trough a specific section of track, in a given
direction. Movement authorities are
assigned, supervised, and enforced by a communications-based train control
system to maintain safe train separation, and to provide protection through
interlockings. |
N |
1474.1 |
multi-cell unit |
|
Two or more battery cells
permanently connected. |
N |
1536 |
multiple unit |
P |
A system of simultaneous
control of all vehicles in a consist from one master control through the
means of trainlines. |
D |
1475 |
network communication timing |
P |
See IEEE Dictionary. |
N |
1475 |
no motion |
P |
A safety-critical function
utilized to indicate that the train is at zero speed or sufficiently close to
zero speed. Used to inhibit the
ability of the doors to open when the train is moving, and can be used for
functions such as emergency brake reset, that may require an indication of
the no motion condition. |
N |
1475 |
operational status |
|
Summary information
regarding the current ability of a system or subsystem to perform its
intended function. |
N |
Not Used |
operator |
|
The organization which
establishes the rail transit system design criteria and technical
requirements for the vehicle it intends to operate on its system. |
N |
RT-1 |
“panic” brake |
P |
Using any available form of
braking, whether or not fail-safe, to obtain the shortest possible stopping
distance. |
N |
1475 |
parallel |
P |
In a propulsion system, the
motor circuit in which the final parallel or series-parallel motor connection
is achieved and the maximum voltage available per motor is applied. |
N |
1475 |
parking brake |
P |
A means that supplies
static braking forces to maintain a vehicle or train in a no motion state. |
N |
1475 |
passenger information sign |
P |
A device which displays,
annunciates or communicates transit trip information to passengers, also,
between passengers and vehicle crew. |
N |
1477 |
passenger mass |
|
The mass of each passenger
used in the calculation of the structural loads, fully seated load (AW1)
through structural load (AW4), shall be a minimum 75 kg (65 lb). |
N |
RT-1 |
penalty brake |
P |
A function of the automatic
train protection portion of the master control system, accomplished by a
safety critical full-service or emergency brake application. NOTE-Although most commonly
associated with an overspeed operating condition, penalty brake initiated for a variety of reasons,
depending on the vehicle design and the requirements of the authority having
jurisdiction. |
N |
1475 |
penalty overspeed condition |
|
A condition requiring the
application of the penalty brake by the automatic train protection subsystem
in order to assure safe train operation |
N |
1472.2 |
performance evaluation |
|
The technical assessment of
a system or system component to determine how effectively operating
objectives have been achieved. |
N |
1482 |
Personal Computer Memory Card International
Association |
|
An association to
standardize methods for connecting peripherals to portable computers. |
N |
1477 |
pneumatic brake pipe |
P |
A pressurized air line,
continuous over the length of the train, used variously to indicate train
integrity, provide indication of a emergency condition, equalize reservoir
pressures, or propagate a brake application signal. |
N |
1475 |
power “knock out” |
P |
A function, derived from friction
brakes being applied above a low preset level on any truck, that removes
propulsion power on every vehicle in the train. |
N |
1475 |
propulsion system |
P |
The system of motors, drive
mechanisms, controls, and other devices that propels or retards a vehicle. |
M |
1475 |
purchaser |
P |
The entity which
contractually acts as the customer. |
N |
1475 |
reaction time |
P |
See IEEE Dictionary. |
N |
1475 |
ready to run load vehicle loads (AW0) |
|
The mass of vehicle ready
to run with all mounted components including full operating reserves of
windshield fluid, sand, etc., and the mass of the train operator but without
any passenger load. |
N |
RT-1 |
redundancy |
P |
The existence in a system
of more than one means of accomplishing a given function. |
Y |
1475 1474.1 |
regenerative brake |
P |
A form of dynamic brake in
which the electrical energy generated by braking is returned to the power
supply line, provided to on-board loads, or a combination thereof during the
braking cycle instead of being dissipated in resistors. |
M |
1475 |
rheostatic brake |
P |
A form of dynamic brake in
which the electrical energy generated by braking is dissipated as heat in
on-board resistors during the braking cycle. |
N |
1475 |
reliability |
P |
The probability that a
system will perform its intended functions without failure, within design
parameters, under specific operating conditions, and for a specific period of
time. NOTE-The ambient
environmental conditions for operation are specified by the authority having
jurisdiction, or, in the absence of such specifications, by IEEE P1478/D4.0. |
M |
1475 1474.1 |
remanufactured (vehicle) |
|
A vehicle that, in order to extend its service life, has been structurally restored and had installed new or remanufactured components totaling a cost of 60% or more of then-prevailing vehicle replacement costs. NOTE-The act of rebuilding
or remanufacturing is to be interpreted as a major rehabilitation,
tantamount, in certain regulatory contexts, to building anew. It should not be confused with overhaul,
which is to be interpreted as a scheduled maintenance action implicit in the
defined service life of the vehicle. |
|
Not Used |
resistive loads |
A |
Loads for which the current
supplied by the low voltage power supply/battery varies proportionally to the
source voltage. NOTE – These loads will
demand less current when the source voltage is switched from the low voltage
power supply to the battery.
Typically, relays fall into this category. |
N |
1476 |
response time |
P |
See IEEE Dictionary. |
N |
1475 |
reverse |
P |
The direction of operation
which is opposite to forward. |
N |
1475 |
reverser |
A |
(A) The portion of the
master controller used to change the commanded direction of train movement. |
N |
1475 |
safe |
P |
Having acceptable risk of
the occurrence of a hazard. |
N |
1483 |
safe braking model |
P |
An analytical
representation of a train’s performance while decelerating to a complete
stop, allowing for a combination of worst-case influencing factors and
failure scenarios. A
communication-based train control equipped train will stop in a distance
equal to or less than that guaranteed by the safe braking model. |
N |
1474.1 |
safety |
|
Freedom from those
conditions that can cause death, injury, occupational illness, or damage to
or loss of equipment or property, or damage to the environment. |
N |
Not Used |
safety assurance |
|
A
characteristic of the implementation of a system which assures a level of
safe operation. |
N |
1483 |
safety assurance concept |
P |
A
design concept applied to processor-based systems which assures the fail-safe
implementation of identified functions, including safe operation in the
presence of hardware failures and/or software errors. Examples are: Checked Redundancy; Diversity
and Self-Checking; Numerical Assurance; and N-Version Programming. |
N |
1483 |
safety critical |
P |
A term applied to a system
or function, the correct performance of which is critical to safety of
personnel and/or equipment. A term
applied to a system of function, the incorrect performance of which may
result in an unacceptable risk of a hazard.
See also: fail-safe. NOTE-A safety-critical
designation may require the incorporation of additional special safety design
features. NOTE-Vital functions are a
subset of safety-critical functions. |
N |
1475 1474.1 1483 1473 |
safety validation |
P |
A structured and managed
set of activities which demonstrate that the system, as specified and
implemented, performs the intended functions and that those functions result
in overall safe operation. Validation answers the question, “Did
we build the right system?” |
N |
1483 |
safety verification |
P |
A structured and managed
set of activities which identify the vital functions required to be performed
by the system, and demonstrate that the system, including its subsystems, interfaces
and components, implements the vital functions fail-safely to a level that
meets the allocated system safety goals.
Verification answers the
question, “Did we build the system right?” |
N |
1483 |
sampling rate |
P |
The frequency with which
the event recorder regularly monitors an input channel to determine its
value. |
N |
1482.1 |
sanding |
P |
Dropping or blowing of sand
or similar material on the top of the rail head to increase the coefficient
of friction to obtain better adhesion. |
N |
1475 |
screen |
|
The total, full physical
viewing area of display monitors. |
N |
1474.2 |
self-revealing component failures |
P |
Component failures whose
effects on system operation are immediately and clearly apparent to a
properly trained person. |
N |
1483 |
series |
P |
In a propulsion system, the
motor connection in which all motors are connected in series for the purpose
of supplying them with some fraction (usually one-half) of the available
voltage.. |
N |
1475 |
service |
P |
The operation of the
vehicles under normal conditions with or without revenue passengers. |
D |
1475 |
service braking (maximum) |
P |
A nonemergency brake
application that obtains the (maximum) brake rate that is consistent with the
design of the brake system, retrievable under the control of master control. |
M |
1475 1474.1 |
service revenue |
P |
|
Y |
1474.1 |
short-time operating voltage |
|
A supply voltage, operation
at which for a defined period of time will not damage the apparatus. |
N |
16 |
slide, wheel |
P |
See wheel slide. |
|
|
slip, wheel |
P |
See wheel slip. |
|
|
snow brake |
P |
A constant application of
light friction brake intended to create enough heat to mitigate the buildup
of snow and ice which would interfere with the brake actuators. |
N |
1475 |
software error |
P |
A
error in a system software element which, when executed, results in
unintended system operation. |
N |
1483 |
spin, wheel |
P |
See wheel spin. |
|
|
state of charge factor |
A |
Actual capacity of a
battery expressed as a percentage of a fully charged. NOTE – This is based on
experience, application (cycling/float service), and charging parameters. |
N |
1476 |
status |
|
The condition or state of a
system, component, or parameter at a particular time. |
N |
1482 |
step signal |
P |
See IEEE Dictionary. |
N |
1475 |
storage rate |
P |
The frequency with which
sampled signals are recorded in crashworthy non-volatile memory. The event recorder may store any signal
less often than it samples. |
N |
1482.1 |
straight air brake |
P |
An arrangement of brakes
whereby air is admitted from the main reservoir through a brake valve to the
straight air pipe to the brake cylinders in the operating unit. NOTE-In most rail transit
vehicle applications, an electro-pneumatic overlay is utilized to assist in
the straight air brake command transmission. |
N |
1475 |
straight air pipe |
P |
A method of transmitting a
pneumatic command from the active cab to the straight air brake equipment on
each vehicle in the operating unit. |
N |
1475 |
stroke width |
P |
In character recognition,
the distance between two stroke edges, measured perpendicular to the stroke
centerline. |
N |
1477 |
structural energy absorption zone |
|
Section of carbody where
controlled deformation is allowed while the integrity of the remaining
carbody is maintained. This zone is
usually at the ends of the carbody. |
N |
RT-1 |
structural load vehicle loads (AW4) |
|
AW1 plus 8 passengers per m2
(6.7 passengers per yd2) in standing areas, and train operator on
board.. |
N |
RT-1 |
subsystem |
P |
See IEEE Dictionary. |
N |
1475 1482 |
supplier |
P |
The entity which
contractually acts as the source of a product. NOTE-The supplier may or
may not be the actual builder. |
N |
1475 1476 1536 |
“switch” (position) |
P |
In a propulsion system, the
historic name for the lowest level of positive tractive effort and power; so
called because it is typically utilized for slow-speed switching movements
such as yard moves, train makeup, etc. |
N |
1475 |
system |
P |
See IEEE Dictionary (19). |
N |
1482 |
system load vehicle loads (AW2) |
|
AW1 plus 4 passengers per m2
(3.3 passengers per yd2) in standing areas, and train operator on
board.. |
N |
RT-1 |
system safety |
P |
The application of
engineering and management principles, criteria, and techniques to optimize
all aspects of safety within the constraints of operational effectiveness,
time, and cost throughout all phases of the system life cycle. |
N |
1483 1474.1 |
system safety goals - qualitative |
|
A
qualitative expression of the level of fail-safety which shall be achieved by
a system, expressed in terms which can be realistically compared to the
results of the safety verification process. |
N |
Not Used |
system safety goals - quantitative |
P |
A
quantitative limit of the probability and/or frequency with which any vital
function fails to be implemented safely. |
N |
1483 |
system safety program |
P |
The combined tasks and
activities of system safety management and system safety engineering that
enhance operational effectiveness by satisfying the system safety
requirements in a timely, cost-effective manner throughout the system life
cycle. |
N |
1483 1474.1 |
system safety program plan |
P |
A formal document that
fully describes the planned safety tasks required to meet the system
requirements, including organizational responsibilities, methods of
accomplishment, milestones, depth of effort, and integration with other
program engineering and management functions. |
N |
1483 |
time constant |
P |
See IEEE Dictionary. |
N |
1475 |
time critical |
P |
Applications where the
communications delay is bound to a fixed upper limit, independent from the
load conditions. |
N |
1473 |
time, dead |
P |
See dead time. |
N |
1475 |
time, reaction |
P |
See reaction time. |
N |
1475 |
time, warm-up |
P |
See warm-up time. |
N |
1475 |
topology |
P |
The geometric pattern or
configuration of intelligent devices and how they are linked together for
communications. |
N |
1473 |
track brake |
P |
A magnetic friction brake
that compresses against the running rail and is activated by an electrical
signal. |
D |
1475 |
traction system |
P |
See: propulsion system. |
|
1475 |
tractive effort |
P |
That force generated at the
wheel-rail interface as a result of the action of the propulsion system. It may be either positive, indicating
motoring/powering, or negative, indicating brake. |
D |
1475 |
train |
P |
A consist of one or more
basic operating units. |
D |
1475 1473 1477 1474.1 |
train control system |
P |
The system for controlling
train movement, enforcing train safety, and directing train operations. |
N |
1477 |
trainline(s) |
P |
Wires and/or pipes routed
though and between vehicles or units by means of couplers, jumpers, or other
means so that power or signals may be transmitted to all vehicles of the
train. |
N |
1475 |
trainline interoperability |
P |
The ability of basic
operating units that constitute a train to communicate successfully with each
other through coupler interface(s), without limitation as to the sequence or
orientation of the basic operating units within the train, and without
requirement for manual configuration other than optional manual confirmation
of basic operating unit sequence within the train. |
N |
1473 |
transport time |
P |
See IEEE Dictionary. |
N |
1475 |
trip switch/cock |
P |
A device mounted on the
truck of a vehicle, responding to a raised arm on the wayside, used to cause
an emergency brake application if a train attempts to pass a mandatory stop
signal. |
N |
1475 |
truck |
P |
A rail vehicle component
that consists of a frame, normally two axles, brakes, suspension, and other
parts, which supports the vehicle body and can swivel under it on
curves. If powered, it may also
contain traction motors and associated drive mechanisms. |
Y |
1475 |
unit |
P |
See: basic operating unit. |
Y |
1475 1473 1474.1 |
unsafe |
P |
Having unacceptable risk of
the occurrence of a hazard. |
N |
1483 |
user interface |
|
That portion of the
human-computer interface in which the communication based train control
(CBTC) user interacts with the CBTC system to observe/or perform functions
implemented by the CBTC system..
Includes, but not limited to, displays, audible indicators, tactile
entries, cursor positioning device implementations, voice input devices. |
N |
1474.2 |
user profile |
|
A definition of the audio,
visual, language and physical characteristics of the communication based
train control user. |
|
|
vehicle |
P |
A land conveyance assembly
for carrying or transporting people or objects, capable of traversing a
guideway, having structural integrity and general mechanical completeness but
not necessarily designed for independent operation. |
Y |
1475 1473 1474.1 1477 1476 1536 |
vehicle mass |
|
The
mass of vehicle ready to run, consisting of the completely assembled body
with all mounted components, including full operating reserves of windshield
fluid, sand, etc., and the weight of the operator, but without any passenger
load. Classified as AW0. |
N |
RT-1 |
vital |
P |
See:
safety critical |
N |
1473 |
vital function |
P |
A
function in a safety critical system, which is required to be implemented in
a fail-safe manner. Note
– Vital functions are a subset of safety-critical functions. |
N |
1483 1474.1 |
warm-up time |
P |
See IEEE Dictionary. |
N |
1475 |
weak field |
P |
In a propulsion system, a
motor connection or operating mode in which the exciting field current is
less than the full field value. |
N |
1475 |
weight, actual |
P |
See actual weight. |
|
|
weight, crush loaded |
P |
See crushed loaded weight. |
|
|
weight, empty |
P |
See actual weight. |
|
|
wheel diameter compensation |
P |
A function which corrects
for either the wear of the wheel(s) or the difference(s) in rolling diameter
between different wheels on the vehicle or both. |
N |
1475 |
wheel slide |
P |
During braking, the
condition existing when the rotational speed of the wheel is slower than that
for pure rolling contact between tread and rail/running surface. Note – For convenience and
simplicity, the definition of wheel slide, wheel slip, and wheel spin ignore
the presence of the microslip phenomenon generally called “creep” physically
necessary to generate longitudinal force at the wheel-rail interface. |
N |
1475 |
wheel slip |
P |
The condition existing when
the rotational speed of the wheel does not correspond with pure rolling
contact between tread and rail/running surface. Note – For convenience and
simplicity, the definition of wheel slide, wheel slip, and wheel spin ignore
the presence of the microslip phenomenon generally called “creep” physically
necessary to generate longitudinal force at the wheel-rail interface. |
N |
1475 |
wheel spin |
|
During acceleration, the
condition existing when the rotational speed of the wheel is faster than that
for pure rolling contact between tread and rail/running surfaces. Note – For convenience and
simplicity, the definition of wheel slide, wheel slip, and wheel spin ignore
the presence of the microslip phenomenon generally called “creep” physically
necessary to generate longitudinal force at the wheel-rail interface. |
N |
1475 |
window |
|
In a graphical user
interface, a defined portion of the display screen that is separated by a
from from the rest of the screen and which may be opened, closed, resized and
moved by the user. |
N |
1474.2 |
REFERENCE STANDARDS
The information contained in
this listing is based upon the standard drafts as listed below:
WG |
No. |
Draft |
Date. |
Description |
|
ASME |
|
|
|
|
RT-1 |
D3 |
09/25/00 |
Structural Requirements for
Light Rail Transit Vehicles |
|
RT-2 |
|
|
Structural Requirements for
Heavy Rail Transit Vehicles |
|
|
|
|
|
|
IEEE |
|
|
|
1 |
1473 |
1999 |
|
Communication Protocol on
Trains |
2 |
1474.1 |
1999 |
|
Communications-Based Train
Control (CBTC) Performance and Functional Requirements |
2A |
P1474.2 |
D2.0 |
10/00 |
User Interface Requirements
in Communications Based Train Control (CBTC ) Systems |
2B |
|
|
|
CBTC Wayside Environmental
Requirements |
3 |
P1482 |
D699 |
06/99 |
Rail Vehicle Monitoring and
Diagnostic Systems |
3A |
1482.1 |
1999 |
|
Rail Transit Vehicle Event
Recorders |
4 |
1483 |
2000 |
|
Verification of Vital
Functions in Processor-Based Systems Used in Rail Transit Control |
5 |
1475 |
1999 |
|
Functioning of and
Interfaces among Propulsion, Friction Brake and Train-borne Master Control on
Rail Transit Vehicle |
6 |
1476 |
2000 |
|
Passenger Train Vehicle
Auxiliary Power Systems Interfaces |
7 |
1477 |
1998 |
|
Passenger Information
System for Rail Transit Vehicles |
8 |
P1478 |
D9.0 |
07/12/00 |
Environmental Conditions
for Rail Transit Car Electronic Equipment |
9 |
P1544 |
|
|
Transit Communications
Interface Profiles for Rail Transit Systems |
10 |
P1536 |
|
03/01/00 |
Rail Transit Vehicle
Battery Physical Interface |
11 |
P16 |
D1.4 |
06/21/00 |
Electrical and Electronic
Control Apparatus on Rail Vehicles |
12 |
P1558 |
|
|
Software Documentation |
13 |
P1536 |
D2.0 |
02/01 |
Electrical Sizing of NiCad
Batteries |
14 |
P1570 |
D1.0 |
07/00 |
The Interface Between the
Rail Subsystem and the Highway Subsystem at a Highway Rail Interface |
|
|
|
|
|
Note: P indicates proposed
standard. Standards that are issued do
not contain the P prior to the number.
Revisions
Version 1: May 8, 1998
Version 2: May 28, 1998
Added
version numbers to this document.
The
following definitions were modified: adhesion, basic operating unit, braking
effort, consist, control voltage, derail detector, electric coupler, emergency
brake, fade, load weighing, master control, no motion, parking brake, safety
critical, train, trainlines(s), wheel slide, track brake, unit, wheel slip, and
wheel spin.
These
changes are based upon P1475 D 4.1.
Version 3 June 8, 1998
Added
health for P1482.1
Version 4 June 17, 1998
Includes
abbreviations and added other document usage to the definition table.
Added
definitions for manufacturer.
Modified
the FRA Event Recorder to FRA Compliant Event Recorder.
Version 5 September 11, 1998
Abbreviations
were added for AWG, ML, MTBE, MTBF, PD, PV and TCRP.
Definitions
were added for doors closed, doors locked, headway, manufacturer, movement
authority and topology.
Definitions
were revised for apparatus
interoperability, basic operating unit, brake – emergency, brake – track,
consist, control voltage, coupler interface, doors open, load weighing,
parallel, safety critical, series, topology, and weight – actual.
Version 6 September 17, 1998
Abbreviations
were added for EMC, HEP, LVPS, and NEMA.
Abbreviation
usage added for ANSI in 1476.
Definitions
were added for aging factor, constant power load, HVAC compressor pull down,
rebuilt, remanufactured, resistive load, sampling rate, state of charge, and
storage rate.
Definition
usage deleted for failure in 1482.1.
Definition
usage added for authority having jurisdiction and vehicle in 1476
Version 7 October 3, 1998
Definition
for automatic train supervision was revised to include a note.
Version 8 November 3, 1998
Corrected
abbreviations for FRA and FTA.
Definition
for block was changed to use the IEEE Dictionary.
The
definition of safety critical was changed based on the recirculation ballot.
Version 9 December 1, 1998
Added
definitions the mean time between hazardous events and self-revealing component
failures.
Revised
definitions for hardware failure, mishap, safe, safety critical, software error
and unsafe.
These
changes were based upon P1483 version D0.14.
Version 10 January 22, 1999
Corrected
abbreviation for IEC and location of NFPA abbreviation.
Added
definitions for aging factor (previous IEEE Dictionary), constant current loads
and interface (previously IEEE Dictionary).
Revised
definitions for constant power loads, HVAC compressor pull down, lay-up
condition and resistive loads.
Version 11 June 8,1999
Added
abbreviations for AAR, ASCE, CENELEC, EMI, FMEA, ITE, MTTR, MTTRS, NOAA, RF,
SAE, SSHIA, SSn-FTA, SVP and UL.
Added
status column to definition section.
Added
definitions for buff load, carbody, closing speed, crashworthiness, crush load,
designer, energy absorption load, operator, primary injury, safe braking model,
seated load, secondary injury, system design load, vital and vehicle mass.
Updated
definitions for auxiliary wayside system, communication-based train control,
concept level, coupler interface, fail-safe, fault tree analysis, functional
fault tree, functional level, heavy rail transit, implementation level, mean
time between hazardous events, movement authority, safe braking model, safety
critical, time critical and trainline interoperability.
Added
additional usage to ATO and time critical.
Added
a table to define the classes associated with 1478 environmental Standards for
Rail Transit Equipment.
Added
ASME RT1 standard to table to indicate the agreed upon joint usage of
definitions between the two organizations.
Added
working groups 9 through 12 to Reference Standards Table.
Version 12 July 2, 1999
Corrected
abbreviation for IEC.
Added
abbreviation for IVPS.
Added
definitions for galvanic isolation, intermediate voltage power supply (IVPS),
load shedding and low voltage power supply (LVPS).
Corrected
definitions for aging factor, constant current loads, constant power loads, and
heating ventilation and air conditioning(HVAC) compressor pull down.
Updated
revision level for standard P1476.
Version 13 July 15, 1999
Corrected
definition for functional fault tree.
Updated
revision level for standard P1483.
Version 14 October 14, 1999
Modified
definitions for carbody, crashworthiness, end sill compression (buff load) and
system design load.
Buff
load was changed to end sill compression (buff load).
Deleted
designer and operator.
Version 15 January 7, 2000
Added abbreviation for BC.
Corrected abbreviation for TRCP.
Corrected definitions for aging factor, constant power load, galvanic isolation, intermediate voltage power supply and resistive loads.
Updated revision levels for various reference standards.
Version 16 November 27, 2000
Added abbreviations for AASHTO, ACSES, APTA, AREMA, GPS, GUI, ITS, MDS and NTCIP.
The definition status was revised to include published indicated by the letter “P”. Published means accepted by the standard’s editors.
Definitions were revised to agree with the final wording and format used by the standard’s editors.
Definitions were revised to agree with the latest drafts of the standards as listed in the reference standards table.
Added definitions for ambient temperature, bonding, corona effect, creepage, designer, display, ergonomics, function key, gap, grounding, passenger mass, screen, user interface and window.
Deleted definitions for FRA compliant event recorder, primary injury, rebuilt and secondary injury.
Deleted the 1478 class definition table, as the classifications were not used in the final standard.
Version 17 December 6, 2000
Corrected abbreviation for APTA.
Version 18 February 13, 2001
Added abbreviations for ampere hours.
Added definitions for high discharge rate, low discharge rate, medium discharge rate, and multi-cell unit.
Added usage of 1536 to abbreviations and definitions.
Added 1536 revision level to reference standards table.
Version 19 April 12, 2002
Added definitions for communication based train control user, control action, display screen, function key, penalty overspeed condition, short-time operating voltage and user profile.
Modified definitions for display, user interface and windows.
Added ASME RT-2 standard to reference standard table.
Corrected Software Documentation working group number form P1588 to P1558.
definitions.doc