British Transport PoliceAn image of a man has been released after an incident took place on board a train to Aberdeen.
The incident happened close to Dundee railway station between 2.30pm and 6pm on April 25.
The man is described as white in his late 40s or early 50s, slim build and around 5ft 7ins with long greying-blond hair tied in a ponytail.
He is believed to have alighted the train at Montrose.
He was wearing a light grey baseball cap, a dark coloured jacket over a grey jumper, black jeans and light boots. He was also carrying a large white suitcase and a dark backpack.
The nature of the incident is not known.
Detectives are appealing for the man pictured, or anyone who knows him, to contact BTP by texting 61016 or by calling 0800 40 50 40, quoting reference 573 of April 25.
Alternatively, witnesses can contact Crimestoppers anonymously on 0800 555 111.
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