Page 564 - IRSEM_Main Book

48. "Train Protection Radio" means the system which shall be used by any staff or worker
to alert the Train Operator to stop and protect a running Train in the event of an
emergency.

a) "Train Radio" or "Train Radio System" means the system for Controllers (specifically
Traffic Controllers) and Train crew to communicate with each other, and exchange
necessary data information between the wayside/ground devices and on-board
devices.
b) "Transponder" means a part of ATC Device installed between rails to send
information to Trains for the position correction.
c) "Yard Radio" or "Yard Radio System" means the system which is used for
communication between Station (including Rolling Stock Depot) staff and On-board
crew during shunting in yard.

Annexure G2: Brief of High Speed Signalling – Mumbai-Ahmedabad Page 507 of 535