Detectives are appealing for information after a woman woke to find a man sexually assaulting her on a train.
The incident happened on a service between Edinburgh and Wolverhampton around 9am on Thursday 23 October.
The man then got off the train at Wolverhampton.
British Transport Police has released a CCTV image of a man they want to speak to as part of the investigation.
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Anyone who recognises him is urged to text 61016 or call 0800 405040.
Information can also be given anonymously to Crimestoppers on 0800 555 111.
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