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| London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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#9
May 27th 10, 11:44 AM
posted to uk.transport.london
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Post office railway reuse
On Thu, 27 May 2010 02:09:07 +0100, Basil Jet
wrote: On 26/05/2010 15:04, Paul Terry wrote: In message , d writes Tunnels arn't dug with picks and shovels any more - a TBM won't care if it has to dig the whole tunnel itself or theres a small tunnel already there , it will take more or less the same time. The only difference will be in the amount of spoil needing to be carried away. Which reminds me that there were several proposals to use the Post Office Railway to remove spoil from the central area. I haven't heard anything more of the suggestion, though. Wouldn't it be easier to remove the spoil by the Crossrail tunnels they had just dug? Not necessarily. In most tunnelling projects you have conflicting movements of excavated spoil coming out and lining segments going in, with workers going in and out. If the spoil comes out via a separate route, it reduces conflicts and might improve progress. |
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