A man who performed an indecent act on a train from Romford to Shenfield is being hunted by British Transport Police.

Officers have released this CCTV image of a man they want to talk to about the incident on Sunday, October 16, in front of a woman on the train.

The woman boarded the 7.40pm National Express East Anglia service at Romford to travel to Shenfield.

At the station she saw the man and waited until he had boarded the train before getting on to another carriage.

Shortly before the train arrived at Shenfield the man approached her, exposed himself to her and began to perform an indecent act.

She challenged the man’s behaviour at which point he stopped and quickly fled the train when it arrived at Shenfield.

The woman also left the train at Shenfield and reported the incident to station staff and police.

Detective Constable Michael Bute said: “We also believe this may have been the same man who the victim witnessed behaving in a similar way earlier on in the evening on a train between Liverpool Street and Newbury Park.”

DC Bute added: “Fortunately this type of incident is very rare, but understandably the victim was left shaken and upset by what she had been forced to witness.”

Anyone who recognises the man pictured or has any information can call British Transport Police on 0800 40 50 40 quoting reference B3/LNA of 24/11/2011, or you can call Crimestoppers anonymously on 0800 555 111.