British Transport Police have launched a CCTV appeal following an incident which took place on board a train to Airdrie.
They have released the image of a man they believe may hold information in relation to the incident, which took place onboard the Edinburgh Waverley to Airdrie between 11.09pm and 11.30pm hours on January 17.
The man is described as being around 5' 7"/5' 8" tall, approximately 35 years of age with a strong Liverpool accent.