OATC Profiles
Open Architecture Train Control

Rail Vehicle Tractive Effort Interface

Definitions for a candidate Tractive Effort Signal Profile are described in this public document by Bombardier and used by NYC Transit on its R-142 Bombardier and R-142A Kawasaki trains:

043-BRA-0077 (pdf) 
NYCT IEEE-1473 Propulsion Interface

This IEEE document also defines a propulsion interface using very similar definition to that defined in by IEEE RTVISC Working Group 5 that developed this approved standard: 

 IEEE 1475  in 1999.

The Transportation Task Group of the LonMark Interoperability Association is now developing a Tractive Effort Profile 

Rail Vehicle Monitoring and Diagnostics

Currently, the most complete and comprehensive public document defining initial Profiles for Monitoring and Diagnostics using IEEE-1473 appears to be this Bombardier Document used by NYC Transit:

043-BRA-0072 (pdf) 
NYCT IEEE 1473 Monitoring & Diagnostics

The LonMark Interoperability Association's Transportation Task Group  is currently developing LonMark Profiles compatible with IEEE-1473 based networks. It is attempting to coordinate its efforts with those of IEEE RTVISC WG3 IEEE-and WG9. 

Vehicle ID Tag

Industry standard AAR tags are used on virtually every freight car in the US. They are also deployed on 1300 buses in Seattle and being deployed on Flexiblok CBTC projects by Bombardier throughout the US including SEPTA, SFO, and elsewhere. It is also used on many other transportation vehicles.

The principle advantages of this commercial off the shelf Amtech RF-ID tag is its cost and wide acceptance by the rail industry. A new Profile is proposed that will be consistent with the AAR's RF-ID inteface.

More details appearing here soon.  

Single Wire Signals™

Single Wire Signals are similar to Single Wire Switch Machines (see below). SWS contain embedded intelligent controllers based upon the ANSI/EIA 709 protocols and are based upon upon open LonMark Profiles that are interconnected via a single electrical conductor. Thus, SWSs require only a single electrical conductor for both electrical power and secure bi-directional communications. Where the running rail cannot be used as signal power return, a separate return conductor is used. 

See this initial disclosure statement for an early concept diagram 

Commands to SWSs control and flash signals at programmable rates, provide automatic filament voltage control and automatic night/day illumination. Status indications from SWSs can be used to verify the health and state of a signal. 

More information Coming Soon

Single Wire Switch Machine
Single Wire Points Machine

Single Wire Switch Machines (SWSMs) are switch machines with an embedded intelligent controller based upon ANSI 709 and a new open OATC Profile. At a minimum, SWSM's require only a single electrical conductor for power and secure bi-directional communications. This single electrical conductor may be daisy-chained to all switch point machines in a given area. If the running rails cannot be used as a common ground return, a separate conductor can be added for the return path.   

SWSM's offer safety, reliability and cost benefits over other hardwired switch machines. Entrance rack and cabling requirements are greatly simplified because a little as one conductor may be necessary for an entire yard for power as well as control and indication data. Switch throw time and current profile can be monitored by the controller within each machine. If throw time or current exceeds preset limits an optional alarm can be generated to warn of an impending failure. If an existing interlocking system includes the option to subscribe to this diagnostic capability it becomes possible for a tower or control center to automatically notify maintenance to make adjustment or repair before the impending failure occurs. 

It is possible to interface SWSMs to either traditional Solid State Interlockings or to new OATC interlockings (see below) to provide these added benefits. This is because SWSM are based upon OATC guidelines and architectures. Interfaces are fully exposed based upon LonMark Profile. This allows signal system and other manufacturers the ability to develop custom interface boards for their proprietary solid state interlockings. 

More information on SWSMs will be appearing here soon.  Here is an early concept diagram

Smart Track Circuit

Details coming 

Non Communicating Train Detection (NCTD)

Details coming


Transaction Based Interlocking™ 

Transaction Based Interlockings (TBIs) interface with Single Wire Switch Machines (or traditional switch machines retrofitted with SWSM controllers) Single Wire Signals and other subsystems using the open serial communications protocol based upon ANSI 709. The use of ANSI 709 and serial communications with SWSMs  provides an open industry standard for interfacing, reduces installation costs, increases system reliability and reduces space requirements by eliminating the need by conventional interlockings for many bulky cables, terminations, fuses, and entrance racks required by traditionally discrete parallel hardwired systems.   

With TBI's all changes in input or output are time-stamped and recorded in a standard database. Thus, every change in state (command or status) results in a new record entry in the interlocking database.