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London Underground's Northern Line tunnel between East Finchley and Morden (on the section via Bank station) is 27.8 km.

The oldest tunnel in current use is on the East London line between Wapping and Rotherhithe. It was built as a twin pedestrian tunnel by Sir Marc Brunel in 1843 and was converted to railway use 20 years later. Sir Mark was the father of the more famous Isambard Kingdom Brunel, the designer of ships and the Great Western (or "God's Wonderful") Railway. The sub-Thames tunnel is now a protected historic structure.  

by Londonbear on Mon Dec 12th, 2005 at 11:58:11 PM EST
London Underground's Northern Line

Sorry, I forgot to exclude subway tunnels! If I included them, there would be several more on the list - for example, the 40.5 km circular Metrosur line in Madrid I discussed with Migeru.

BTW, can you find a source with the precise (to the meter, I only have to 100 m or even 1 km) length for the two giant London tunnels along the CTRL-2?

Isambard Kingdom Brunel

A legend, tough I was surprised that when BBC(?) had people vote on the greatest British inventor, he came out on top. (And your city has an amazing ensemble of architectural monuments, makes me envious!)

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Tue Dec 13th, 2005 at 12:50:58 PM EST
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