Graffiti vandals have undone hours of restoration work by volunteers at Spa Valley Railway.
Late in the evening on Sunday 20th April, paint sprayers attacked an historic local train in the sidings and caused major damage.
The cost of repairs is estimated at £ 30,000.
Kent Police say their officers attended the scene to carry out initial enquiries and are now asking the public for help.
Anyone with information is urged to call the west Kent appeals line on 01622 604100, quoting reference BOS-26130-25-4693-IR.
Local residents with private CCTV or drivers with dashcam, who may have been in the area at the time of the incident, are also asked to check for footage.
You can also call Crimestoppers anonymously on 0800 555111 or complete their online form.

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