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A Stop Board marking the start of a radio token section at Rannoch railway station on the West Highland Line. The blue light is a TPWS status indicator.

Portable equipment is available for visiting locomotives. Here Bradley Manor of the former GWR is prepared for service on the Cambrian Line, Wales.

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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. The system is slightly similar to North American direct traffic control, which unlike RETB does not have a cab display unit.