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
considered by the Loco unit of other trains approaching either from front or
rear side of the said train.
5.4.2 The traffic direction shall normally be determined through RFID, It shall be
determined through GPS receiver on startup or restart or as fallback
arrangement of RFID.
5.4.3 The traffic direction shall be used for determining whether two trains are
approaching, one following the other or going away from each other.
5.4.4 The train direction shall be determined based on position of cab control. This
direction shall be used for detecting Roll back/ forward & Reverse movement.
5.5 New Train Formation
A train shall be considered as a new formed train by loco TCAS under one or
more of the following situations:
(i) When loco unit has been switched on or restarted;
(ii) When loco unit has come out of Banking/ Coupled mode ;
(iii) When direction of movement of loco has changed in station section;
(iv) When length of the train has changed by more than 10 meters.
5.6 Train Length Assignment
5.6.1 Loco unit shall assume a default train length under one or more of the
following situations:
(i) When Loco unit has been switched on or restarted;
(ii) When Loco unit has come out of Banking/ Multiple mode;
(iii) When direction of loco movement has changed in station section;
5.6.2 The default train length shall be 700m which shall be configurable at the
installation stage.
5.6.3 Every station unit shall monitor the status of track circuits identified for
measurement of train length either for the stopping train or for the train with
default train length. Station unit shall communicate the location of boundary of
Track Circuit, time of occupied & clear status of these track to each Loco unit
which is not in Multiple or Coupled mode. Loco unit, based on its location at
the timings so received, shall calculate its train length.
5.6.4 The train length so calculated by Loco unit shall be stored by it replacing the
previously stored train length with time stamp under one or more of the
following conditions:
(i) If the previous train length was default train length;
(ii) After stopping at a station, if the train length calculated by Loco unit
differs the previously stored train length by more than 10m. This
difference in train length shall be user programmable.
5.6.5 The accuracy of the train length measurement by Station unit shall be within ±
5 meters.
5.6.6 Based on the train length calculated by Loco unit, it shall also correctly detect
whether the train is a Light Engine or not. In case the train is detected as Light
Engine, Loco unit in association with BIU shall also apply with higher BC
pressure corresponding to loco independent brake in addition to NB/SB/EB.
5.6.7 Station unit shall have provision of programming time correction value which
shall be used by it for correcting the time of clear status of track circuit
referred in5.6.3.
5.6.8 Station unit shall also have provision for programming a maximum period of
track circuits referred in Clause 5.6.3, remaining occupied to differentiate
occupation of these track circuits by train or due to failure. If occupation period
of these track circuits is beyond the defined period of time, Station unit shall
not transmit the timings for calculation of train length.
5.6.9 On not receiving the timing information from Station unit even upto 1 minute of
its entry into block section, Loco unit shall seek acknowledgement from the
Loco Pilot in token of assurance that the train composition & hence the train
length has not changed nor new train has been formed at this station. In case
Signal Directorate RDSO/Lucknow Page 16 of 56