Detective Chief Inspector Iain Miller said: "There were two groups of men who came together at the station as the train arrived. Two people tried to board the train, eight people tried to get off the train. There was a bit of an altercation which spilled onto the platform.
The result of that altercation was that one of the men was punched and fell between the moving train and the platform, that resulted in his death. There were at least eight people involved, other than the two witnesses.
We need more of those people to come forward and anyone else who was at the station or around the station at that time, between 11.40pm and midnight.
We have a lot of CCTV to trawl both on the train and in and around the station. That's being done by officers from British Transport Police.
Friends of 22-year-old Ryan Harrison who was killed when he was caught between a platform and a moving train at Guildford Station.
Three men are being quiestoned over his death
Friends have paid tribute to a 22-year-old man who died after he was hit by a train following an altercation at a railway station.
The victim, named locally as Ryan Harrison, from Woking, Surrey, was with a friend at Guildford station at 11.40pm on Saturday when he became involved in the confrontation which involved a number of other men.
Shortly after the altercation, Mr Harrison was fatally injured by a train.
South East Coast Ambulance Service paramedics attended but Mr Harrison was pronounced dead at the scene.
His family have been notified and his death is being treated as suspicious, according to British Transport Police.
Friend Jake Lund wrote on Facebook: "cant believe this has happened to such a nice person, rip Ryan".
Amir Ahmed also wrote on Twitter:
RIP Ryan Harrison. Still in shock. Gone, but never forgotten.
Police are investigating an incident in which a person was hit by a train at Guildford Station at around 11.40pm on Saturday 30 March.
Our immediate thoughts are for the family of the person involved. We are providing information to assist police with their inquiries into the circumstances of the incident.
As a result of the incident, Guildford Station was closed to allow police to complete their investigation.
However, the station re-opened at 8.15am yesterday (Sunday 31 March) and services returned to normal.
Detectives are questioning three men on suspicion of murder after Ryan Harrison, 22, was hit by a train following an altercation at a railway station.
The man, from Woking, Surrey, was with a friend at Guildford station at 11.40pm on Saturday when he became involved in the confrontation which involved a number of other men, police said.
Two 19-year-old men from Guildford were arrested at the scene while a third man, from Cranleigh, handed himself in at a police station in Guildford later.
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One lane closed due to accident on A3 Northbound between Egerton Road (Cathedral Turn) and A320 (Stoke Road interchange).