British Transport Police officers are investigating an assault at Moorfields station that took place over the weekend.
Images released by British Transport Police (BTP) show two men that they are seeking regarding the crime.
At 10pm on Sunday 7 November, the two men were refused travel by a member of rail staff for being too intoxicated to travel.
One of the men then headbutted the member of rail staff as he tended to an injured member of the public.
Officers believe the men in the images may have information that could assist their investigation.
If you recognise them or have any information, please contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 2100084732.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111.
Images: British Transport Police