At around 2.30pm on June 19, two men drove up to a depot near the station in a white Ford Transit van. They then entered the unit and took a drum of copper cable, worth more than £6,000.
The men then drove away at speed.
Do you recognise the man in this image? Officers would like to speak to him in connection with the incident, as it is believed he may have information which could help the investigation.
Anyone with any information is asked to contact BTP by calling 0800 40 50 40 or texting 61016 with reference 1800043894.