Detectives investigating a sexual assault on board a train from Matlock to Nottingham have released this image in connection with the incident.
On Tuesday 30 September at around 4.45pm, a woman boarded the train at Duffield railway station.
British Transport Police said that as she walked through the carriage, she passed a group of three people. A man in the group has sexually assaulted the young woman and made an inappropriate comment. The man left the service at Nottingham railway station.
Anyone who recognises him or has information is asked to contact British Transport Police by texting 61016, or by calling 0800 40 50 40 quoting reference 517 of 30 September.
Information can also be given anonymously to Crimestoppers on 0800 555 111.
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