Police are trying to trace vandals that sprayed graffiti on a stationary train carriage at Midland Railway Centre at Butterley, Ripley.
It was sprayed on the carriage, which was at Swanwick Junction railway station, Butterley Hill, sometime between 4pm on Tuesday, February 14 and 11am on Wednesday, February 15.
Officers investigating the incident have released an image of the damage to see if anyone recognises the tag, or has any information.
If you saw anything suspicious or think you could help the contact PCSO Sarah Dufton, quoting reference 17000066339, on 101.
You can also send her a message online at: www.derbyshire.police.uk/Contact-Us.
Alternatively, you can also contact Crimestoppers anonymously on 0800 555 111.