A 24-year-old man who died after reportedly leaning out of a train window may have been looking to see why the train was travelling slowly, a witness suggested.
The Gatwick Express passenger, from East Grinstead in Sussex, was on the high-speed service bound for London Victoria when the man was struck around 5.30pm on Sunday.
He was pronounced dead at the scene. The Rail Accident Investigation Branch has been notified and is investigating.
Witnesses on Sunday suggested the train may have been slowing down as it came into Wandsworth Common station, in south London.
The man, who was reportedly travelling alone, is believed to have then stuck his head out of an unlocked droplight window, usually used by conductors, prompting speculation he may have been looking at something.