A TEENAGE girl was allegedly sexually assaulted on board a train.

Cops have released a CCTV image of a man they wish to speak to.

Just before 7pm on March 14, a man boarded a train at Crewe railway station, having travelled from Liverpool, and sat next to a teenage girl.

He is then alleged to have assaulted her before leaving the train at Manchester Piccadilly.

Detectives would like to speak to the man pictured, as they believed he may have information that could help their investigation.

Anyone who recognises him is asked to contact British Transport Police by texting 61016 or calling 0800 40 50 40, quoting reference 639 of 17 March.

Information can also be given anonymously to Crimestoppers on 0800 555 111.