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(d) It shall give a warning to the Loco Pilot to enable him to react and to avoid
intervention from on-board equipment for application of service brake.

(e) It shall not be possible to mute the warning and to stop automatic brake
applications by prior operation on Driver Machine Interface (DMI).

(f) It shall not be possible to cancel the Emergency brake application initiated
by interrupting the power supply to the system.

(g) The speed sensors shall be provided on the locomotive itself or on the
coach housing the on board equipment for EMU/MEMU.

13.1.6 Conformity to Schedule of Dimensions:

The track side and on-board equipment shall not in any way infringe the
schedule of dimensions being followed by the Indian Railways.

13.1.7 Power Supply Arrangement:

(a) Track Side: The track side system of the ATP shall work on AC or DC
power supply & shall have power backup. The power supply shall run from
power supply room to line side equipment on line wise separate cable with
redundancy in diversified path preferably.

(b) Onboard: The On board equipment of the ATP shall work on the DC power
supply available in the locomotive.

13.1.8 Operating Modes & its Transitions:

(a) The current mode of On-board equipment shall be indicated to the Loco
Pilot by means of suitable indications on the DMI.

(b) In case of mode transition, when the responsibility of the loco pilot
increases due to the result of such automatic transition, the OBC shall seek
an acknowledgement from the loco pilot, irrespective of whether the train is
stationary or moving. In case the transition has to be acknowledged and
the loco pilot fails to acknowledge as required, the OBC shall initiate a
brake application.

13.1.9 Application/Executive Logic Handling:

(a) The programming/feeding of data to Track side or On-board equipment shall
be suitably protected against unauthorized use.

(b) The executive logic uploaded in Track side or On-board shall be of approved
type.

(c) Factory Acceptance Testing shall be carried out on the application logic
before uploading it in track side or On-board.

(d) Version Control and checksum shall be effectively implemented for both
Application and executive logic.

(e) Zonal Railways shall set up a system to implement the changes in signal
interlocking and track description data for effective functioning of ATP system.

Chapter 13: ATP, ETCS, IRATP (TCAS) & TMS Page 276 of 535