A4 - Sir Nigel Gresley - approaching Highley Station doing a token swap.
Spring 2022 Steam Gala, Severn Valley Railway - UK
Tokens are the method used to ensure only one train at a time can enter a section of single track.
The signal box operator (standing track side in the photo) must release a token to allow a train to enter a particular section of the track - and then no other tokens can be released for that section of the track until the previously released token has been clocked back in.
RB67 + HP5 + ID11 (1+1)
MG Cooltone RC + MG Dev
Martin
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