A man grabbed a woman's bottom while she walked past him on a train.
The incident happened on the 8.14pm service from Aberdeen to Inverness on June 16 as it travelled between Keith and Elgin.
At about 9.20pm, a 22-year-old woman was walking through one of the carriages when the man grabbed her. She turned around and told him not to do that, before walking off.
Investigating officer Detective Constable Nick Ritchie said: "No-one has the right to treat another person like that.
"We're determined to stamp out this kind of behaviour from our rail network, so please, if you know this man, let us know.
"If you're ever made to feel uncomfortable, are the victim of a sexual assault or witness one taking place, you can discreetly text us on 61016 and that text goes straight through to our control-room."
The man got off the train at Elgin and is believed to have been travelling with about seven other men.
He was white, around 25, 6ft and wearing a black and white top and sunglasses.
British Transport Police have asked anyone with information to contact them by by texting 61016 or calling 0800 40 50 40.
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