British Transport Police have released a CCTV image after a member of railway staff was assaulted during a ticket dispute at Gloucester station.
The incident happened just before 11am on Sunday 26 October, when a man was stopped at the gate line for travelling on a child ticket. During the confrontation, he punched one staff member in the face and grabbed the body-worn camera of another before leaving the station.
Officers believe the man pictured may have vital information and are urging anyone who recognises him to come forward.
Witnesses can contact BTP by texting 61016 or calling 0800 40 50 40, quoting reference 206 of 26 October.
Information can also be given anonymously to Crimestoppers on 0800 555 111.