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Cab Secure Radio
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.
== 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.〔In the Railway rule book there is provision for a driver stopped at a red signal to disembark the train and access a track-side telephone in order to talk to the signalman. This might be occasioned by a scenario where there was a track circuit failure and the signals had reverted to the safe condition. The rule book however also requires the train to be continuously manned during normal running operations. CSR was first introduced to allow the driver to talk to the signalman without leaving the train. The safety features associated with CSR whereby a signalman can send an alarm to a train or order a train to stop using a single data transmission service later secured CSR as a safety facility that could be deployed on a more universal basis. However it wasn't until the Clapham Rail disaster and subsequent Hidden report also followed by the accident at Cowden where the real value of the facility was learned.
(【引用サイトリンク】 Railway Signs and Signals of Great Britain )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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