Officers from British Transport Police are appealing for witnesses after a man exposed himself on board a train on the Dundee line.
The incident happened on board the 1.39pm ScotRail service between Dundee and Aberdeen on Friday March 2.
As the train left Montrose station, a man who was travelling as part of a larger group stood and exposed himself to other passengers on the train.
A British Transport Police statement said: “Passengers were visibly offended by this man’s indecent behaviour.
“The man is described as white, approximately 6ft and with short blond hair.
“He was wearing a white dress which he lifted to expose himself and it is believed he was travelling as part of a stag do celebration.
“Officers are appealing for witnesses to this incident to get in touch. Likewise, if you know the man matching the description, please contact BTP.
“Information can be passed to BTP by sending a text to 61016 or by calling 0800 40 50 40 quoting reference 308 of 02/03/2018. Alternatively, pass information to Crimestoppers anonymously on 0800 555 111.”