BRITISH Transport Police wish to speak to this man following an alleged sexual assault on a train.
Detectives believe the man has connections to Derby and have issued his picture in the hope that anyone who recognises him will come forward.
The incident took place on a train from Leeds to Sheffield on Saturday, August 23, but police have only now released the images.
PC Lee Marshall, who is investigating the offence, said: "A 19-year-old woman from Sheffield boarded the train at Leeds.
"As she took her seat, a man sat close to her and tried to engage her in conversation. He then moved seats to sit opposite the victim and began to make suggestive comments to her, while rubbing his foot up and down her leg.
"Noticing the woman looked upset, a member of rail staff asked her to come with them to a different carriage."
The victim explained she was not with the man and took a seat in another carriage.
PC Marshall said: "The woman got off the train at Sheffield and walked over a footbridge.
"The man followed her off the train, grabbed her by the shoulders and made another suggestive remark. The victim then reported the incident to us, but the man had already left the station.
"We believe he may have travelled to Sheffield from Huddersfield. It is also possible he may have connections to the Derby area.
"I believe the man in the image we are issuing can help with our investigation. If you recognise him please contact us."
Anyone with information is asked to contact British Transport Police on 0800 40 50 40, or text 61016, quoting reference PSUB/B7 of 19/09/2014.