Officers investigating an indecent exposure offence on a service from Accrington to Manchester have released this image in connection.
At 11pm on Friday, July 15, a man sat opposite a woman on the train and exposed himself to her.
Officers believe the man in the image may have information which could help their investigation.
If you recognise him, or have any information, please contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 2200070564.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111.
