The man then calmly walked away from the woman towards platform four and onto a train.
Luckily the victim was not left with any visible injuries, but this was a shocking and unprovoked assault.
We do not tolerate violence like this anywhere on the rail network and I'd urge anyone who recognises the man pictured, or who may have witnessed what took place, to come forward and assist officers in this investigation.
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Tonight, dry with clear spells initially.
Minh Chi Lam, 58, subjected one of his victim, 18, to an hour long attack in the nail bar in east London.
The victim, in her 40s, was walking along Sutherland Road when she was suddenly was grabbed from behind.