A fight that started on a York train spilled out onto a station.
Now police have released images of two men they want to talk to about the incident.
It began on the York to Darlington train at around 9.55pm on Saturday 31 May.
Two groups of men began arguing. They left train at Darlington railway station where the situation escalated into a fight in the taxi rank area in front of many members of the public.
One pair left the station on foot while the other men re-boarded the train. Detectives believe the men in the images may have information which could help with their investigation.
Anyone with information is urged to contact British Transport Police by texting 61016 or by calling 0800 40 50 40 with the reference 716 of 31 May.
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.