A woman who fell asleep on a train woke to find a naked man sitting next to her.
British Transport Police (BTP) are treating the incident as “public indecency” and have appealed for witnesses to come forward in an effort to trace the suspect.
The woman was on a train between Polmont and Edinburgh Waverley at around 7.21am on 20 April.
The man later got dressed in black, putting on jogging bottoms, a t-shirt and walking boots before leaving the train at Edinburgh.
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He is described as white, around 5ft 6in tall, of slim/medium build, and aged 65-70. He had short grey hair and a stubbly beard.