Police are looking for a man accused of sexually assaulting a woman on a train.
British Transport Police released CCTV images as part of their investigation into the assault.
A man is reported to have sat opposite a woman and repeatedly touched her inappropriately while asking her to come to his house.
He then left the train at Lincoln Central and walked into the city centre.
The incident happened between 1.30pm and 2pm on Tuesday, January 29 between Gainsborough and Lincoln.
Anyone who recognises the man or has information about the incident is being urged to call 0800 40 50 40, quoting incident 1900009078.