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Engineers wait to check tunnel damage

News

DAMAGE TO tunnels and track from the terrorist attacks is unlikely to be catastrophic, experts said this week.

As NCE went to press, Tube Lines was mobilising spare train parts and surveying equipment near Russell Square ready to start work to check the condition of the damaged train as soon as soon as forensic experts leave the site.

It will begin the task of removing carriages and checking cables and the cast iron tunnel lining. Until then it has little knowledge of the damage to infrastructure.

The bombers appear to have used commercial or military high explosive, but much of the energy from the blasts would have been absorbed by the structure of the tube trains and the bodies of the victims.

'There may have been some distortion to the cast iron segmental lining of the Piccadilly Line, ' Railway Forum director general Adrian Lyons said.

'But the twin track Circle Line tunnels are much larger, and if the bombs were only 5kg or so the effects would have soon dissipated.' Track construction is traditionally robust, with hardwood sleepers embedded in insitu concrete.

Since the explosions did not cause fires, most signalling cabling is believed to be intact.

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