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A passenger was left with a fractured shoulder and needed stitches in his face after being attacked on a train.
The incident happened on board a service between Ramsgate and Dover at around 11pm on Friday, December 29.
The victim was punched by a man who also stamped on his upper body and head rendering him motionless on the floor.
He was taken to hospital where he received treatment for a fractured shoulder and also needed stitches to his face.
Officers have released an image of a man they believe may have information that could help their investigation.
Anyone with information should contact the British Transport Police by texting 61016 or by calling 0800 40 50 40, quoting reference 727 of 29/12/23.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111.