Use
The driver initialises the CSR with an area code followed by the identification number of the signal in front of the train. The radio then automatically sends the stock number of the train (e.g., 455112), to the signalling system. The signaller then allocates a train reporting number (e.g., 2M34) to the train. This reporting number is used by the signalling equipment to track the progress of the train as it moves through the rail network.
Each signalling area (or signal panel within a larger signalbox) uses a different radio channel corresponding with an area code. As the train passes from the jurisdiction of one signaller to another, the CSR in the driver's cab changes channel automatically. Lineside signs are provided to inform the driver of where the area code changes. Occasionally the radio may fail to change channel or lose the signal completely, in which case the driver can enter the code manually.
Read more about this topic: Cab Secure Radio
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