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Tunnel

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Tunnel
Definition
Wikipedia articleDbpedia source
This article is about underground passages. For other uses, see Tunnel (disambiguation). A tunnel is an underground passageway, completely enclosed except for openings for entrance and exit, commonly at each end. A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. The central portions of a rapid transit network are usually built in tunnels. Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers. Utility tunnels are used for routing steam, chilled water, electrical power. or telecommunication cables, as well as connecting buildings for convenient passage of people and equipment. Secret tunnels are built for military purposes, or by civilians for smuggling of weapons, contraband, or people. Special tunnels are built to to permit wildlife, such as European badgers to cross highways without becoming roadkill.
Tunnel
English Wikipedia http://en.wikipedia.org/wiki/Tunnel
Spanish wikipedia http://es.wikipedia.org/wiki/T?nel
Wiki page external link http://cprr.org/Museum/Sierra_Grade_8-2003/Donner_Pass-Summit_Tunnel/index.html http://home.no.net/lotsberg/index.html http://homepages.cwi.nl/~aeb/math/samos/ http://i34.tinypic.com/23ixthy.jpg http://i36.tinypic.com/16k1ahx.jpg http://memory.loc.gov/cgi-bin/ampage?collId=pphhphoto&fileName=ca/ca2400/ca2413/photos/browse.db&action=browse&recNum=0&title2=Central%20Pacific%20Transcontinental%20Railroad,%20Tunnel%20No.%2041,%20Milepost%20193.3,%20Donner,%20Placer%20County,%20CA&displayType=1&itemLink=r?pp/hh:@field(NUMBER+@band(ca2413)) http://triton.disi.unitn.it/index.html http://web.archive.org/web/20070621120811/http:/www.nyc.gov/html/dep/html/news/3rdtunnel.html http://www.ita-aites.org http://www.liverpoolwiki.org/Liverpool%27s_Historic_Rail_Tunnels http://www.mustardgas.org http://www.pipejacking.org/ http://www.remuseum.org.uk/rem_his_engineer.htm http://www.transglobalhighway.com http://www.tunnelintelligence.com/safety-in-detail-106.html http://www.tunnelsonline.info

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Fecha publicación: 27.8.2014

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