Tender invited for Development of Train Collision Avoidance System

ISO 9001: 2008 Effective from 18.06.2012 RDSO/SPN/196/2012 Version 3.1.1
Document Title : Specification of Train Collision Avoidance System
the speed by application of the Full Service Brake and/ or emergency brakes
in collision like situations or as the case may be.
5.8.6 It shall be possible to test the working of all brake valves of Brake Interface
Unit (BIU) in stationary condition of the train by pressing Manual Brake Test
(MBT) button by the Loco Pilot. The MBT shall be possible to be initiated
through a soft key on the OCIP.
5.8.7 The braking logic of the Loco unit shall be so intelligent that based on the
default or assessed brake characteristics of the train and depending upon the
speed of the train, gradient of the location & the target, Loco unit shall decide
which type(s) of brake & when to be applied to stop the train short of safe
distance or control the speed to desired value before target without frequent
repeated braking. In case the distance available between the two trains at the
instance of perceived danger is not adequate, Loco unit shall apply maximum
brake to reduce the speed of the trains as much as possible under the
circumstances so that impact is minimized.
5.8.8 Design of the Loco unit equipment shall be such that its braking interface unit
can be isolated by the Loco Pilot when so warranted. The isolation of braking
interface shall be communicated to the Centralized Management System. To
deter its incorrect use, the isolation mechanism must be protected and
isolation of braking interface must be recorded. Also, the message about such
isolation shall be displayed on Loco Pilot’s OCIP to inform Loco Pilot about
isolation of TCAS. Isolation of TCAS/BIU shall not affect existing brake
characteristics of the loco/other self-propelled vehicles. Traction cut off
feature through TCAS shall also be isolated under such events.
5.8.9 In order to control the train speed to a particular ceiling limit with reference to
a location or to stop the train with reference to a location or prevent collision,
Loco unit shall intelligently take decision about type & location of brake
application based on the speed of the train, distance from the target, brake
characteristics of the train (assessed or default) etc. so that train speed is
controlled or train is stopped, as the case may be, within a safe distance of
200m from the target. In case of Stop Signals at ON, it shall stop close to the
signal with safe front end of the train within 50m on approach to the signal.
5.9 Track Identification Number (TIN)
5.9.1 Each track shall have designated Track Identification Number (TIN).
5.9.2 Each straight track shall have single unique designated TIN end to end i.e.
from block section to station section then to block section. Each line in the
station section having berthing portion shall have different TINs.
5.9.3 The TINs used for loop lines at a station can be reused on other stations.
5.9.4 Prior to start of TCAS territory, arrangements shall be provided to allocate TIN
of that track to Loco unit before it enters the TCAS territory.
5.9.5 Further, inside the TCAS territory, Loco unit shall be able to self-deduce the
change in its TIN whenever it changes the track after negotiating the point
zones. For this purpose duplicated RFID tags shall be provided at each entry/
exit of each point, at entry/ exit of each station section and at not more than
1000m interval in block section.
5.9.6 There shall be no case of assignment or deduction of wrong TIN by Loco unit.
5.9.7 In exceptional cases of incorrect track identification number by a Loco unit, it
shall go to ‘Controlled Mode’.
5.9.8 After the train leaves TCAS territory, Loco unit shall enter into Unfitted mode
automatically. The driver shall be asked to acknowledge the transition. If the
driver does not acknowledge within 5 seconds, a service brake command
shall be initiated. The driver shall then acknowledge the level transition in
order to release the service brake command.
Signal Directorate RDSO/Lucknow Page 18 of 56