British Transport Police is appealing for help to find a man who punched and swore at a commuter at Haywards Heath station.
The incident happened on February 9, at around 7.40pm.
PC Billy Burstow said: “The victim, a 37-year old man from Haywards Heath, was leaving the station via the ticket barriers, when another man shuffled up behind him, treading on his heel.
“Believing the man was trying to force his way through the barrier, the victim challenged his behaviour. At this point the other man became aggressive, swearing at the victim and punching him in the face. He continued to shout abuse as he exited the barriers, before leaving the scene.”
As part of their investigation, officers have issued an image of a man they want to talk to.
PC Burstow said: “Thankfully, violent behaviour of this sort is rare on the rail network. When it does happen, we work hard to find those responsible.
“I am confident the man in the picture can help with our enquiries. Who is he?”
Anyone with information is asked to contact British Transport Police on 0800 40 50 40, or text 61016, quoting reference SSUB/B7 of 10/03/2015.
Alternatively call charity Crimestoppers on 0800 555 111.