British Transport Police are investigating the theft of a piece of equipment from Exeter Central station.
The special lamp is used to give signals to drivers and dispatch trains safely.
A member of staff put it down on a window sill and when he came back, it had gone.
Police have issued this photo of a man they would like to speak to in connection with the incident
If anyone has information they should contact the British Transport Police on 0800 40 50 60 quoting reference B2/WWA of 14/10/13.
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