CCTV images have been released following an incident on a train.
The incident took place on Thursday, May 23 on the 11.14pm ScotRail Glasgow Central to Kilmarnock service.
British Transport Police (BTP) believe the man in the image may have information that can assist them with their investigation.
Officers are urging the man or anyone who recognises him to contact them.
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He is described as 5’7 tall, with dark hair and stubble, in his 30's with an Ayrshire accent.
He was wearing a patterned jumper, beanie hat, green knee-length shorts and khaki Adidas trainers.
Anyone with information is urged to contact BTP on 0800 40 50 40 or by texting 61016 quoting reference 2400065504 of May 23. Information can also be given anonymously to the independent charity Crimestoppers on 0800 555 111.
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