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
4.18.10 Stop Mode – This mode is entered into automatically if the train is stopped
by TCAS.
4.18.11 The various functions to be performed in various modes of Loco unit have
been defined tentatively in Annexure-IX. These shall be finalized after
development & trial of the system.
4.19 Any transition of mode of Loco unit while the train is moving shall be automatic
in principle.
4.20 Transitions of mode which occur while the train is stationary, shall be initiated
automatically or manually as appropriate.
4.21 If, as a result of an automatic transition, the responsibility for the Loco Pilot
increases, the Loco unit shall seek an acknowledgement from the driver,
whether the train is stationary or not.
4.22 In case the transition has to be acknowledged and the Loco Pilot fails to
acknowledge as required, the Loco unit shall initiate a service brake application
unless otherwise other factors warrant application of Emergency Brakes.
4.23 During the transition period between two modes the supervision provided shall
at least ensure the same protection provided by the least restrictive mode.
4.24 The current mode shall be displayed on Loco Pilot’s OCIP.
4.25 Transition from TCAS to Non-TCAS territory & vice versa:
i. The trains equipped with Loco TCAS shall be able to run in non TCAS
territory.
ii. The transition of Loco TCAS from TCAS to Non-TCAS territory shall
seek acknowledgement by the Loco Pilot. If the Loco Pilot does not
acknowledge after the transition for 200m (configurable) the brake shall
be applied. If the Loco Pilot acknowledges afterwards, the brake can be
released.
iii. The transition of Loco TCAS from Non-TCAS to TCAS territory shall
also seek acknowledgement by the Loco Pilot. However, in case of
failure of Loco Pilot to acknowledge, there shall be no brake application.
4.26 The TCAS shall conform to the Safety Integrity Level (SIL) 4 as per CENELEC
standards or equivalent.
5. Functional Requirements
5.1 Loco unit shall be checked while leaving the loco shed, using Automatic testing
equipment to ensure the functional capability of complete TCAS, including the
health of complete hardware & software, satisfactory working of brake interface
unit and communication capability.
5.2 The TCAS equipment shall perform an automatic self-test when the equipment
is switched ON. This self-test shall not require any action on the part of the
Loco Pilot/ operator. This self-test must test all vital elements. The result of selftests
shall be indicated on OCIP.
5.3 On startup or restart, the Loco unit shall go to Controlled mode if restarted
within stipulated time (2 minutes nominal) and the last stored mode was not in
‘Unfitted Mode’ or ‘Banking/ Coupled Mode’ or ‘Isolation Mode’. Otherwise or
on startup, the Loco TCAS unit shall go to ‘Staff Responsible Mode’ after
getting Acknowledgement from the Loco Pilot in stipulated time. In all other
cases, It shall go to ‘Controlled Mode’.
5.4 Direction
There shall be two types of direction of movements, one for train such as
forward or reverse and other for traffic such as Up or Dn.
5.4.1 On startup or restart, the Loco unit shall not assume any traffic direction by
default. The traffic direction shall be set only when loco has moved certain
distance in a particular direction. However, if the collision like situation is
perceived before the traffic direction is set, the length of the train shall be
Signal Directorate RDSO/Lucknow Page 15 of 56