A man exposed himself to Brentwood and Havering rail passengers – on three different occasions in four weeks.
Detectives at British Transport Police have today released CCTV images of a man they would like to identify following the incidents, which took place between February 2 and March 1between Brentwood and stations in Havering.
The first incident took place on Saturday, February 2 on a train between Shenfield and Gidea Park. Around 10.45pm the man approached two women on board the train and exposed himself to them.
On Tuesday, February 19, the man approached a woman on board a train between Brentwood and Gidea Park around 10.40pm before exposing himself to her.
The man was again seen on Friday, March 1 at Harold Wood station. After leaving a train at the station at 11.50pm, he exposed himself to the passengers at the station, leaving many of those alarmed by his actions.
Investigators have carried out a number of enquiries into the three incidents, including viewing clear on board CCTV, and taking witnesses statements.
Detective Constable Jon Howlett, the investigating officer, said: "Although these types of incidents are rare on the rail network, it can be an extremely frightening and intimidating experience for the victims.
"The CCTV images here are very clear and I'd urge anyone who recognises the man to please come forward and assist officers in this investigation."
Anyone with information is asked to contact British Transport Police on 0800 40 50 40 quoting B8/LNA of 13/05/2013. Information can also be passed to the independent charity Crimestoppers, anonymously, on 0800 555 111.