A woman was sexually assaulted by a balding man who sat next to her on a London-bound train.
British Transport Police released a CCTV image in connection with the attack on a busy service from Birmingham New Street station to Euston.
The incident happened at around 6.36pm on July 30.
The force believe a man seen wearing a black gilet, white shirt and dark jeans in the snap “may have information that could help with their investigation”.
A spokesman said: “On Wednesday, July 30 at around 6.36pm a man sexually assaulted a woman as she sat next to him on the train.”
Anyone with information 0800 40 50 40 quoting reference 674 of 30 July.
Information can also be given anonymously to Crimestoppers on 0800 555 111.
