British Transport Police has released CCTV images of a man they believe could have vital information about a sexual assault on board a train travelling between Doncaster and Thorne North.
The incident happened on Tuesday, May 5 at around 1.50pm.
Investigating officer DC Lee Parsons said: “The victim boarded the train at Doncaster where a man took a seat next to her. He engaged her in conversation before indecently assaulting her.
“She left the train at Thorne North while the man remained on the train.
“It is vital we speak to the man in the images and we urge him or anyone who recognises him to contact us immediately to assist with our enquiries.
Anyone with information is asked to contact British Transport Police on 0800 40 50 40, or text 61016, quoting reference PSUB/B6 of 21/05/2015.
Information can also be passed anonymously to the independent charity Crimestoppers on 0800 555 111.