A RAIL passenger was repeatedly punched in the face after he told a flasher to stop exposing himself on a train.

Stunned travellers looked on as a man began removing his clothes on the train to Roydon, despite the protests of those on board.

The man eventually agreed to cover up, but then another man, believed to be a friend of the flasher, began to violently attack a passenger as they pulled in to Broxbourne station.

The passenger managed to get off the train at Roydon station, but was attacked again on the platform.

The pair then escaped into Roydon, while the injured man, who suffered several wounds to the face including a cut above the eye, stumbled back onto the train.

British Transport Police are now hunting for people who witnessed the “unacceptable” incident.

PC Glen Fryer, investigating officer, said: “This was a serious incident which saw an innocent member of the public being assaulted after he raised an objection about what was clearly unacceptable behaviour on a train.

“I would urge anyone who travelled on board this train service and who witnessed what happened to come forward and help us with our enquiries.”

It is believed that the pair had been acting in a “disorderly manner” before the attack took place on the train, which had started its journey at London Liverpool Street and was ultimately heading to Bishops Stortford.

The incident began at around 12.20am on Friday September 25, but has only now been made public by police.

Newly released CCTV images show one man wearing a purple t-shirt who officers want to speak to “in relation to the initial act of exposure.”

The second is of a man wearing a grey suit who police believe is a “significant” witness and who "may have intervened at some point during the altercation".

A 32-year-old man from Hoddesdon has been bailed after being arrested in connection with the attack.

Anyone with any information or who recognises those pictured in the CCTV images is asked to call British Transport Police on Freefone 0800 40 50 40 quoting reference B05/122289/2009.

Information can also be passed to Crimestoppers anonymously on 0800 555 111.