The victim was allegedly punched and kicked by another woman after boarding at Heathrow on the 2nd of August.
The alleged attacker got off at Southall station shortly afterwards.
Anyone who recognises the woman in the pitcure is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40, quoting reference 702 of 2 August.
Information can also be given anonymously to Crimestoppers on 0800 555 111.
