At just after 4.30pm on Thursday 15 October, it is reported that a young man was assaulted as he travelled on the Manchester-bound train with a group of friends.
Officers believe the woman in the images may have information which could help the investigation.
If you recognise her, or have any information, please contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 366 of 15/10/20.
