Police are today issuing an image following an assault at Retford Railway Station.
At around 8.30pm on Saturday 16 September a group of four men were talking before an argument broke out on the platform at the station.
One of the men punched one man who fell onto the train tracks, the same man then punched the other two men.
He then left the station before the police arrived.
Officers would like to speak to the man in the image who they believe may have information that could help their investigation.
Anyone with information is asked to contact BTP by texting 61016, or by calling 0800 40 50 40 quoting reference number 688 of 16 September.
Alternatively, call Crimestoppers anonymously on 0800 555 111.