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Detectives are seeking this man after a rail passenger was seen exposing himself and performing a sex act in front of a woman on-board a train to Clapham Junction.
The British Transport Police said a woman noticed a man opposite her in the aisle on board the train from Dorking to Clapham Junction exposing himself and masturbating at around 9pm on August 28.
Officers said they would like to speak to the man in the image who they believe may have information which could help with their investigation.
Anyone who recognises him is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40, quoting reference 698 of 28 August.
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.
