High Quality Content by WIKIPEDIA articles! Radio Electronic Token Block is a system of railway signalling used in the United Kingdom. It is a development of the physical token system for controlling traffic on single lines. On arrival at a "token exchange point", the driver reports his/her position to the signaller by radio and requests the "token" for the next section of line ahead. If the signaller is in a position to do so, he/she will issue the electronic token applicable to the section ahead. Simultaneously, the driver must operate a button on apparatus in the cab to receive the token. The token is then transmitted to the train by radio. The Solid State Interlocking controlling the system prevents the issue of any token permitting conflicting movements.

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