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:
“London Underground is one of the safest railways in the world and normally has a very good safety record. The companies responsible for running and maintaining services have an important duty to ensure that their workers and members of the public are not exposed to unnecessary safety risks.
"However, in this case, London Underground, Tube Lines and Schweerbau, through inadequate management and planning, failed to ensure the safe recovery of an engineering train. This is clearly unacceptable, and led to a potentially catastrophic incident on the Northern Line where the train careered out of control for over four miles. It was only the professionalism of control room staff taking decisive action which prevented a collision between trains, and averted a much more serious outcome.
"We welcome the steps taken by the companies to improve safety management on London Underground since this incident. The regulator will continue to closely monitor the actions of all parties involved, and will not hesitate to step in should further safety failings be found."
"Thiswas clearly a serious incident and London Underground and Tube Lines actedquickly to investigate its causes and take action to ensure that the risk ofsuch a rare incident recurring was minimised.
"Following the incident LU immediately put in placeprocedures to remove the engineering train and tow-bar from use on the railway.
"Since then LU and Tube Lines have put in place even tighterapprovals and controls for the design and use of all such equipment.
"LU staff's swift actions meant that this incident was drawn to a safe conclusion. London Underground has an excellent and improving safety record, with more than ten times fewer serious incidents on the Tube than in 2000. This has been achieved in part by ensuring that all significant incidents are investigated thoroughly and the root causes addressed.”
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.