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Current Project:

                                                                                         (Last updated on 25.10.2017)

Development of Train Collision Avoidance System (TCAS)


Development of Train Collision Avoidance System (TCAS) Train Collision Avoidance System (TCAS) is meant to provide protection by preventing trains to pass signal at Danger (Red), excessive speed over turnouts / Speed restrictions and to avoid the situation in which more than one trains are on the same track to cause collision, in case operations are not able to control so. It also provides assistance to Loco Pilots by means of real-time display of signal aspects in Loco Pilot’s cab. It is based on the determination of location of Trains through distance traversed from RFID tags installed on track and transmission of signalling related information from Stationary Unit such as Station Interlocking.



Brief History: The specification for the first phase i.e. Absolute Block System were drafted as RDSO/SPN/196/2012 Version 3.1.1 through the process of EOI in the year 2011-12. In the year 2012-13, the Concept Field Trial has been conducted (in Oct-2012) in Secunderabad Division of SC Railway. Demonstration to Chairman Railway Board & Member Electrical was made on 16.10.2012. Further, demonstration to Committee of Additional Members from Railway Board was also made on 10.11.2012. Based on successful demonstration, to undertake trials on 250 km. section, tender was opened on 15.01.2013 in which 08 firms participated. By end of 2012-13, few agencies have been able to develop lab demo models. Trials in Lingampalli- Vikarabad- Wadi- Bidar Section of SC Railway have been taken up for further development of TCAS. Initially two field trials were conducted, first trial from 29.08.2013 to 05.09.2013 and the second trial from 24.09.2013 to 30.09.2013. Major breakthrough was achieved during the second trial, in which basic inter-operability between two vendors was tested successfully involving loco equipped of M/s Medha equipment could inter-operated in the station provided with RFID tag and station equipment of M/s Kernex and vice versa. The same was witnessed by DG/RDSO also. It was also possible to test basic functionality of equipment developed by both the vendors including display of signal aspect, movement authority, target speed and distance etc in the locomotive. Subsequent to above trials, detailed technical discussion was held with both the vendors on 9th& 10th Oct 2013 at RDSO in which optimization of data transmission was finalized and also all the issues related to interoperability were clarified and further course of action for interoperability test in the lab and in the field was finalized. Purchase Order for Contract Package-A & B was placed in June 2013 on M/s Medha and M/s Kernex and for Contract Package ‘C’, was placed in November 2013 on M/s HBL for development of Train Collision Avoidance System.



Current Status: Brake Interface Unit was developed by all the three firms and got certified from the motive power directorate of RDSO. The field trials are underway in 250 KM section in Secunderabad division of South Central Railway. The RDSO specification for Train Collision Avoidance System (TCAS) No. RDSO/SPN/196/2012 Version 3.2 dated 17.05.2017was updated to resolve the issues observed during these field trials The development is now complete and the Independent Safety assessment certification for all the three firms is expected by December 2017.


Future Planning:TCAS field trials in South Central Railway are conducted with IRAB type locomotives with maximum permissible speed of 100/110 KMPH. Railway board has permitted conceptual  TCAS field trials with E70 & CCB type brake interfaced Locos (WAP-5) with speeds up to 160 KMPH at BAAD station in Delhi-Agra section of Agra Division of North Central Railway. Preliminary interface scheme for WAP-5 locomotives equipped with CCB/E70 have been decided in association with Loco directorate of RDSO and OEMs. TCAS installation in loco no 30107/WAP-5 with CCB type brake interface is completed at Electric Loco Shed/ Ghaziabad and is waiting for the trial runs. Installation of Stationary TCAS at BAAD station would be completed by 15.09.2017.


Specification of Train Protection & Warning system


Train Protection & Warning System (TPWS) is a continuous supervision system that provides safety in train operations by dynamically monitoring the speed of the train against specified limits & eliminates risks arising due to cases of Signal Passing at Danger (SPAD) based on ETCS Level-1. The speed limits are specified dynamically based on signal aspect, route to be followed, sectional speed limits, permanent speed restrictions etc.


Till Oct 2017, the system has been commissioned on around 330 route kilometers of Chennai-Gumudipundi section of Southern Railway, Hazrat Nizammudin -Agra section of North Central Railway and Metro Kolkata.



·   Approval for revised TPWS South Onboard equipment Maintenance Guide has been given vide this office letter No. STS/E/TPWS/SR dated 14.08.2013.

·    Approval of brake & train interface for NGEF & BHEL rakes of Kolkata Metro TPWS project was accorded by RDSO vide letter dated 25.11.2013.

·   Technical Advisory Note for implementation of TPWS for newly sanctioned works was issued on 30.03.2016.

·   The existing specification of TPWS has been revised and finalized as RDSO/SPN/183/2016, Version 3.0 based on the field inputs received on 18.11.2016.


As Per Action Plan 2022 issued by Railway Board, TPWS (ETCS-Level1) is to be introduced on 10000 Route Kilo meters. Presently, Zonal Railways are implanting the same on 3690 KM on Delhi-Mumbai, Delhi-Howrah and Mumbai-Chennai Sections of IR.


Failsafe Networked Multiplexer (FNmux)


Failsafe Networked Multiplexer (FNmux) covers the technical and operational requirements for exchanging both vital and non-vital signaling information using dual redundant OFC/Primary radio communication media to replace signaling cables. It shall have safety integrity level of 4 and will be used for vital signaling functions that can be used for proving, control and interlocking.


FNmux will reduce the copper cable used in signalling at station and block and increase in availability due to availability of alternate path. Reduction in cost and time of outdoor work shall be possible.


Following the process of EOI, RDSO is working on development of FNmux. In the mean time it has been observed that there are commercially off the shelf products available which are SIL4 certified and meets the functional requirements of FNmux. Accordingly specification has been modified and draft specification RDSO/SPN/2011/2017 Ver. d3 has been uploaded on website on 17.10.2017 for comments.





Development of Advanced Auxiliary warning system (AAWS)


AWS (OEM M/s Siemens) is installed on Mumbai suburban section for preventing SPAD.  So far M/s Siemens was supporting supply of additional quantity of equipment for new rakes but they indicated that due to obsolescence of some of the components, it will not be possible to support on-board equipment. 


Accordingly, RDSO started working on development of Indigenous Advanced Auxiliary warning system (AAWS) through EOI.

Advanced Auxiliary Warning System(AAWS) provides following functions:


·                     Providing train protection functions similar to AWS system in use in Mumbai suburban section.

·                     Be interoperable with existing AWS system in Mumbai suburban section including use of same driver interface as existing.


It is a microprocessor based control system, which continuously monitors the speed, direction of travel, distance travelled, aspect of the signal passed and alertness of the motorman and thus increases the safety of railway system.


It is a safety device preventing the unsafe situation due to the human failure.


It compels the motorman to obey the aspect of the signal and maintain the correct speed. If it is not well acknowledged with in time AWS decelerates the train and applies brake to stop train.


The specification RDSO/SPN/213 Ver. (1.0) of AAWS was finalized in 2014.


A new vendor M/s Medha has been approved for onboard system of AAWS on 18.09.2015.


Modelling and validation of interlocking for Railway Signalling Systems


Object is to develop tool to improve the reliability & safety aspect of present EI systems. With this model, conversion and verification of safety rules for signalling system based on yard plan, control table and generic signalling circuits shall be possible. Model for equations for given yard for use of application data for EI to be generated and verification of above model to check safety aspect by verifying parallel, conflicting movement and control of points etc shall be possible. Later in next phase, this tool to be used generate verified application data for EI. MoU signed between RDSO & IIT/ KGP, work is progressing in mutual discussions between IIT/KGP and RDSO.


Development of Capacity Optimization & Simulation Tool (COST)


The development comprises of design of basic software tool for computation of line capacity of any Indian Railway section taking into consideration various parameters like type of block working, block length, signal spacing, speed restrictions, and other parameters that would have an effect on line capacity. The tool would be used for examining the effect on line capacity of the technological improvements like Intermediate Block Signalling, introduction ofa new stations, doubling/tripling/quadrupling, etc. The tool would be used for examining the effect on line capacity of changes in operational patterns like using mix of goods and passenger trains, various loco load combinations, intelligent speed adaptation, etc. The tool would assess the extent to which section line capacity could be increased and quantify the impact of each capacity enhancement.


MoU has been signed with IIT/ Mumbai. Meeting held with IIT/ Mumbai in October 2017. Basic model is developed and the improvement are being incorporated in the tool.


Fog Pilot Assistance System (FogPASS):


This is low-cost, portable equipment (Tiffin-box size, 1.5 kg, Battery powered) to be carried by Loco Pilot while taking over duty-charge. It provides on-board real-time information (Display as well as voice guidance) to Loco Pilot regarding Location of fixed landmarks such as Signals, LC Gates etc. in advance to be used particularly in foggy weather. Driver has to watch the landmark as per operating procedure. Driver has to get Signal Aspect (Red / Yellow / Green) etc. from physical trackside signals.


It displays approach indications of next three approaching fixed landmarks such as Main Line Signals, Level Crossing Gates, Neutral Sections, Speed Restrictions, Stations etc. accompanied with voice message at ~ 500m on approach.