e/Cab Secure Radio

Information
has gloss	eng: 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 normal method of communication between driver and signaller, replacing the function of the signal post telephone. CSR will be replaced by a digital system called GSM-R.
lexicalization	eng: Cab Secure Radio
instance of	c/Legacy systems