BBC News Online provides full coverage of the latest in a series of accidents on the UK's railways.
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The investigation
The crash and aftermath
Industry and political reaction
Eyewitness accounts
Previous train crashes
British Transport Police have issued an appeal for information about five "mystery" railway workers seen on the track hours before the Potters Bar train crash. Five people wearing orange rail worker jackets were filmed on CCTV hours before the crash. Maintenance contractor, Jarvis says that points may have been sabotaged.
The BBC's Simon Montague reports
Potters Bar station opened to Monday morning commuters, 10 days after the accident. The investigation is focusing on the bolts which became dislodged from the points outside the station and claims from the maintenance contractor, Jarvis of possible sabotage.
The BBC's Samantha Simmonds reports
Maintenance workers found nuts had come loose from the points outside Potters Bar station nine days before the crash. The engineering team reported that the nuts had been put back in place but the Health and Safety Executive team investigating the crash say the discovery may be very important.
The BBC's Gavin Hewitt reports
HSE preliminary report into crash
Rail investigators are concentrating on a set of points where the crash occurred. The investigation has found that the bolts holding the points in place were not properly fastened as one or more nuts had become dislodged. It is believed the rear carriage came off the rails as the train passed over the points.
The BBC's Duncan Kennedy reports
Railtrack chief executive John Armitt
The 1245BST WAGN service carrying 151 passengers from Kings Cross, London, to Kings Lynn derails at Potters Bar, little more than ten minutes into its journey. Three of the train's four carriages come off the tracks.
Following the crash, many people who live and work in Potters Bar rush to the station in order to help in the rescue operation. They report seeing people lying under the train.
Senior politicians send their condolences to those affected by the crash, as the rail industry's experts start their investigation into what caused the accident. Investigators from the Health and Safety Executive, as well as officials from Railtrack and the train company are involved.
Selby, North Yorkshire: February 2001
Hatfield, Hertfordshire: October 2000
Ladbroke Grove, London: October 1999
The crash
The BBC's Gavin Hewitt reports
The BBC's John Andrew reports on previous rail disasters
Eyewitness accounts
Amadin Ryan: "I saw people catapulted out of the train"
Sam Irving: "We jumped down onto the line and went under the train"
Waitress Shirley Sally: "There were a lot of local people helping out doing what they could"
Industry and political reaction
Transport Secretary Stephen Byers
The BBC's Rory Cellan-Jones reports
The UK Railway Inspectorate's Dr Alan Sefton
Rail Passengers Council's Stewart Francis
Special reports on previous UK rail crashes
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