Photo: BBC
Thirty-one people died when two commuter trains collided on Oct. 5, 1999 near London's Paddington rail station.
Dozens were injured, some of the cars burst into flames - and the plume of smoke was visible across London. Investigators determined one of trains ran a stop signal.
Passenger Mark Rogers said on the BBC: "There was an almighty crash and the train rolled over and over, first onto its roof and then onto its side.
The Paddington wreck occurred on the same stretch on rail line where seven people die in the 1997 Southall rail disaster.
