Police have launched an appeal for witnesses after a man was knocked unconscious on-board a London Bridge train on Friday evening.
The victim was assaulted when he asked a man to stop behaving anti-socially on the delayed 7.59pm service to Gravesend, Kent.
The thug then attacked him, knocking him unconscious and breaking his leg, police said.
Emergency services rushed the man to hospital, where he was still receiving treatment on Saturday.
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