A 26-year-old ticket inspector is punched to the ground by a suspected fare dodger who refused to show his Young Persons railcard.
The shocking incident at London Bridge was captured on CCTV and today released by the British Transport Police.
Footage shows the angry attacker vaulting the ticket barrier to reach his victim, with fellow passengers stepping in to prevent further violence.
Police were called to the station after the assault at 3.20pm on July 30 but the suspect had already fled.
Anyone with information is asked to contact British Transport Police on 0800 40 50 40, or text 61016, quoting reference S-SUB/B17 of 29/10/2014, or call Crimestoppers anonymously on 0800 555 111.
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