At around 12.30 on Monday 18 April, a man sexually assaulted a woman for a prolonged period of time on a train between Stockport and Sheffield.
If you recognise him, or have any information, please contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 2200038110.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111.
