Officers investigating a sexual assault on a service travelling from Liverpool Street to Goodmayes station are today releasing this image in connection.
At 7pm on Tuesday 11 May a man sat next to a woman on a train and tried to engage in a conversation while she ignored him. He sexually assaulted the woman and followed her off the train at Goodmayes station.
The victim escaped him to find a member of staff at the station. The man then boarded a southbound train.
Officers believe the man in this image may have information which could help their investigation.
If you recognise him or have any information, please contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 481 of 11/05/21.
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.