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These incredible CCTV pictures show a Tube maintenance train which was being towed on the Northern Line in August 2010. It then broke free and rolled back down the line at speeds of up to 30mph. It eventually came to a halt on an incline near Warren Street after passing through seven stations.
The driver jumped free of the out of control vehicle as it hurtled through Archway station. A court heard how it came with 600 metres of a passenger train.
Ian Prosser, Director of Safety for the Office of Rail Regulation, said:
Mike Strzelecki from London Underground, said:
Jonathan Ashley-Norman, prosecuting for the Office of Rail Regulation, told the court that the rail grinding unit was being towed when it broke away during the early morning.
It started rolling downhill without brakes from Highgate and into central London in August, 2010.
"It could have led to tragedy but thanks to the immediate actions of LU staff, no one was hurt," said Mr Ashley-Norman.
Mr Ashley-Norman said attempts were made to slow the runaway train down using points at Camden Town and Mornington Crescent, and the trains were diverted onto different lines.
It eventually stopped at Warren Street central London when it reached an upward incline.
The court was told that a fault had now been remedied and the incident was extremely unlikely to occur again.
London Underground, Tube Lines Ltd and Schweerbau GMBH had pleaded guilty to endangering passengers and staff under Health and Safety law, after the 39-tonne maintenance wagon hurtled through seven stations before it could be stopped.
A train in front of it was told to keep going and not stop, while its passengers were told to run to the front carriages, the Old Bailey heard.
Judge Richard Hone said: "There was the potential of terrible tragedy."
He said the runaway train was out of control for four miles during 16 minutes.
"To those involved it must have seemed an extremely frightening eternity," he added.
London Underground and two rail contractors have been fined £100,000 each after a tube maintenance wagon was allowed to run out of control.
The wagon reached speeds of up to 30 miles per hour as it travelled through seven stations on the Northern Line in August 2010.