The boy was with his father at the station filming and taking photos of trains passing through when he was approached by a man at 6.45pm on Friday, March 25.
Investigating officer PC Emma Williamson said: “The man walked across the tracks from platform 2 towards the victim, who was stood next to the level crossing barrier which was down at the time, then swore at the boy and verbally abused him.
“He then trespassed back across the tracks and walked up onto platform 1 and out of sight.
“This must have been a very upsetting experience for the young boy who was simply on a day out with his dad enjoying his hobby.
“The man’s actions could also have had fatal consequences. Trespassing on the tracks and misusing level crossings in this way is extremely dangerous, he was very lucky a train wasn’t coming or the outcome would have been unthinkable.”
The CCTV image is of a man the police believe may have information about the incident.
Anybody who knows the man pictured, or has any information, should call on 0800 40 50 40.
Alternatively, information can be passed to the independent charity Crimestoppers on 0800 555 111.