British Transport Police Detectives investigating an assault on-board a train travelling between Sandhills and Waterloo station have released CCTV images in connection with the incident.
At around 9pm on Tuesday 7 March, the victim boarded the train at Sandhills station where he was confronted by a stranger who punched him several times.
Another passenger who attempted to intervene was also threatened by the man, who boarded the service at Cressington station at 8.42pm.
Detectives believe the man in the CCTV images may have information that could help their investigation.
Anyone who recognises him is asked to contact BTP by texting 61016, or by calling 0800 40 50 40 quoting reference 590 of 07/03/23.