On the 22nd of October at around 3.40pm, a man allegedly sexually assaulted a woman sat next to him on the tram.
Detectives believe the man in these CCTV images may have information that could help with their investigation.
Anyone who recognises him is asked to contact BTP by texting 61016, or by calling 0800 40 50 40 quoting reference 476 of 22 October.
Information can also be given anonymously to Crimestoppers on 0800 555 111.
