A woman was sexually assaulted by another female passenger on the tube, police say.
The attacker sat down next to her at around 7.15pm on October 6.
The victim got up and moved across the carriage, and the woman was then racially abusive to her, before kicking her on the leg.
The woman continued to be abusive as she then left the train at Baker Street.
The assault happened on board a Jubilee train from Bond Street to Baker Street, police said.
Officers believe the woman in the CCTV image may have information which could help their investigation.
If you recognise her, or witnessed the incident, please contact BTP by texting 61016 or calling 0800 40 50 40.
Alternatively, you can call Crimestoppers on 0800 40 50 40.