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Cab Secure Radio (CSR) is an in-cab analogue radiotelephone system used on parts of the British railway network. Its main function is to provide a secure speech link between the train driver and the signaller which cannot be overheard by other train drivers. In areas where CSR is used it must be the primary method of communication between driver and signaller, always being used in preference to the signal post telephone. Within the next few years CSR will be replaced by the GSM-R digital system, as it forms the initial phase of rollout of ERTMS throughout the UK.
Contents
History
CSR was first introduced in the Glasgow area in 1986 to enable driver-only operation of trains. It was later used in the London and Liverpool areas.
Functions
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.
Hardware
CSR cab equipment can be the Stornophone 6000 or a Siemens model.