British Transport Police are asking for help to identify a man they want to speak to about an incident on a Lancashire bus.
Officers are investigating a racially aggravated assault at Carnforth Station that happened on Saturday, April 13.
The incident took place at about 10.20am, as a rail replacement bus was ready to leave the station, heading to Lancaster.
PC Allan Fernie said: “At Carnforth an elderly man boarded the bus service and, without warning or provocation, made unpleasant, racist, remarks to the bus driver and then attempted to punch him.
“This was a particularly nasty incident, directed at a bus driver who was simply trying to help rail passengers make their way from Carnforth to Lancaster – he should have been able to do this without fear of violence or aggression.”
Investigations have allowed officers to piece together the offender’s movements and isolate a CCTV image of a man they would like to speak to about the incident.
PC Fernie added: “We have discovered that the offender initially travelled from Barrow to Carnforth on a rail replacement bus, so it is entirely likely that he has links to both Barrow and Lancaster.
“We have also located an image of a man we believe has information about the incident.
“He is wearing distinctive clothing, including what appears to be a floppy hat, and I am certain someone will recognise him.”
Call British Transport Police on 0800 40 50 40 or ring Crimestoppers, anonymously, on 0800 555 111.