At around 9.20pm on Sunday 27 November, a teenage boy was travelling on the train with a group of friends while a woman stood near the doors on the same carriage.
As the train arrived at Dewsbury station the woman threw a Peroni bottle towards the victim and got off the train.
The bottle hit him in the back of the head, causing a cut and heavy bleeding which required stitches.
If you recognise her, or have any information, please contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 465 of 27/11/22.
Alternatively, call Crimestoppers anonymously on 0800 555 111.
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