A teenager has been sexually assaulted on a train, police have said.

The young woman was on a service between Lockerbie and Glasgow when she was attacked at around 9.30am on Friday, February 8.

British Transport Police said a man, believed to be around 50-years-old, made repeated inappropriate comments to the woman before assaulting her.

The suspect then got off the train at Glasgow Central Station.

BTP officers would now like to speak to anyone who witnessed the incident, and in particular the woman who comforted the victim after the assault and alerted train staff.

If you have any information that could help the investigation, text 61016 or call 0800 40 50 40.