Detectives investigating a report of an assault on board a train from Birmingham New Street to Northfield released the image in connection.
At around 11:45pm on Saturday 11th May, the victims were talking to a man when he suddenly kicked one of them in the chest and the other in the face, breaking her nose.
Officers believe the man in the image may have information that could help their investigation.
Anyone who recognises him, or has any other information, is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40 quoting reference 891 of 11 May.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111.
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