A man has been arrested after a woman was sexually assaulted on a train from Glasgow to Kilmarnock.

British Transport Police said the alleged sexual assault happened at about 20:30 on Thursday.

The man, who was in his 30s, was forced to leave the train and the woman got off at Kilmarnock train station. He was arrested and released under investigation.

Police are appealing for the victim of the assault and for anyone who witnessed the incident to come forward.