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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An eyewitness said: "It was very unnerving. It was just after 12pm and there were suddenly police vans and cars everywhere."