Police have appealed for witnesses to come forward after a worker at Sheffield Station was racially abused last month.
The incident, which happened just after midnight on 20 April, occurred after a man boarded an out-of-service train at the station, British Transport Police have said.
He was asked to leave the train, but became abusive and allegedly racially abused a member of staff.
The man then left the station, and headed towards a nearby bus station.
Police Officers have released a CCTV image of a man they believe could have information which could help with the investigation.
Anyone who may know the man should contact the British Transport Police by texting 61016 or by calling 0800 40 50 40, and quote the reference number 16 of 20/04/2019.
You can also call Crimestoppers anonymously 0800 555 111.