British Transport Police officers would like to speak to the man pictured after a bike was stolen from the cycle rack on platform 1 at Market Harborough station.
The theft took place on Monday 30 November at 2.20pm.
A man arrived at the station on a train from Leicester, approached the cycle rack and removed a bike before riding away in the direction of Rockingham Road.
If you know him please contact the police on 0800 405 040, or text 61016, quoting MSUB/B5 of 13/1/2016.
Information can also be passed anonymously to the independent charity Crimestoppers on 0800 555 111.