Do you recognise this man?
Detectives believe he may have information that could help their investigation.
The incident took place at around 8.15pm on Tuesday 18 April, on board the 7.45pm train from Derby to Stoke-on-Trent.
The victim boarded the service at Derby and during her journey was sexually assaulted.
Anyone who knows the man in the images is asked to contact BTP by texting 61016, or by calling 0800 40 50 40 quoting reference number 101 of 18/04/2023.
Alternatively, call Crimestoppers anonymously on 0800 555 111.
