A woman has been subjected to a prolonged sexual assault on board a train.
Police said the victim's attacker set next to her, engaged her in small talk and then blocked her in her seat.
He then carried out what officers said was a "prolonged and repeated" sexual assault.
The incident occurred between 10.45pm and 11.25pm on Wednesday on the Edinburgh Park to Dunblane service.
The suspect and the victim left the train at Stirling, where he continued to touch her inappropriately and followed her throughout the station.
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He is described as white, of a slim to medium build, with short dark hair.
He was wearing a green jacket and chino trousers.
British Transport Police would like to speak to anyone who witnessed the offence or who knows the identity of the man.
They would particularly like to speak to a member of the public who was sitting opposite the victim who may have vital information.
