At around 5.30pm on Wednesday the 19th of August, the victim alerted station staff that a man had pushed through the barriers.
The man saw the victim report him and punched him twice in the face, causing significant facial injuries which required hospital treatment.
Officers would like to speak to the man pictured, as they believe he may have information which could help their investigation.
Anyone who recognises him is asked to contact British Transport Police by texting 61016 or calling 0800 40 50 40, quoting reference 583 of 19 August.
Information can also be given to Crimestoppers anonymously on 0800 555 111.
