BTPBritish Transport Police has released CCTV images following an incident onboard a Glasgow train.
The incident occurred at around 11.50pm on a service between Glasgow Central and Bellshill at around 11.50pm on May 28.
Officers believe that the man featured in the released images may have information that could assist them.
He is described as white and of medium build, approximately aged in his early 20s. He has brown hair and was wearing a white T-shirt. He also has a large tattoo on his left arm.
BTP can be contacted by texting 61016, or by calling 0800 40 50 40 quoting reference 985 of May 28.
Information can also be given anonymously to Crimestoppers on 0800 555 111.
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