Police have released enhanced CCTV images they hope will help identify a man who indecently exposed himself on a train.
A 23-year-old woman from Tooting, fell asleep on the train travelling between Clapham Junction and Ewell West on January 21.
She woke up at 9am to find him standing nearby and indecently touching himself.
The woman immediately left the carriage and reported the incident to police.
CCTV images of the man have now been released in a bid to identify him.
PC Mark Payne, investigating officer said: "This was clearly a quite distressing ordeal for the victim and we'll do everything we can to catch the person responsible.
"It was difficult to identify a suspect from the initial CCTV images we gathered, but recently we've been able to obtain more enhanced images and have identified a man we want to speak to.
"These are exceptional quality images and I'm sure that someone will know who this man is.
"If you think you can name him, or have any information that could assist our investigation, please get in touch."
Anyone with information should contact British Transport Police on 0800 40 50 40 or Crimestoppers anonymously on 0800 555 111.
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