CCTV footage has been released as part of an investigation into an incident on a train.
An assault occurred on a service from Balloch to Old Kilpatrick on Tuesday, July 25.
The attack happened at around 10.25am on the train.
Officers believe that the man in the images may be able to help with their enquiries.
He is described as white, of medium build, aged between 30 and 40, with short light brown hair.
The man was dressed in a black jacket with a hood, black trousers or jogging bottoms with a red stripe down each side, black trainers and was carrying a black bin bag and black rucksack.
He also was seen to wear a black face mask.
The man, or anyone who knows him or has any information relating to this incident, is asked to contact British Transport Police by texting 61016 or calling 0800 40 50 40 and quoting reference 2300086261.
Alternatively, you can call Crimestoppers on 0800 555 111 where information can be passed anonymously.
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