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.
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