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A tunnel is an underground passage. The definition of what constitutes a tunnel is not universally agreed upon. However, in general tunnels have a ratio of the length of the passage to the width of at least 2 to 1. In addition, they should be completely enclosed on all sides, save the openings for the length of the covered area.
A tunnel may be for pedestrians or cyclists, for general road traffic, for motor vehicles only, for rail traffic, or for a canal. Some are aqueducts, constructed purely for carrying water — for consumption, for hydroelectric purposes or as sewers — while others carry other services such as telecommunications cables. There are even tunnels designed as wildlife crossings for European badgers and other endangered species. Some secret tunnels have also been made as a method of entrance or escape from an area, such as the Cu Chi Tunnels).
In the United Kingdom a pedestrian tunnel or other underpass beneath a road is called a subway. This term was also used in the past in the United States, but is now used to refer to underground rapid transit systems.
More on [ Tunnel ]
Historic :: Roads and Highways
Williamson Tunnels :: History
Full 3g in the subway tunnels. Love verizon
MarkWhyy (Mark Yesilevskiy) Sun, 20 Dec 2009 03:17:49 -0000
Full 3g in the subway tunnels. Love verizon
@Igman05 they have equipment in the tunnels much like other major cities.
codias (Cody Watson) Sun, 20 Dec 2009 02:48:27 -0000
@Igman05 they have equipment in the tunnels much like other major cities.
Hate the detroit airport... Esp its stupid tunnels. Are the sci-fi noises really necessary? http://tweetphoto.com/6791646
OliviaCasares (Olivia Casares) Sun, 20 Dec 2009 02:27:24 -0000
Hate the detroit airport... Esp its stupid tunnels. Are the sci-fi noises really necessary? http://tweetphoto.com/6791646
Audio: Arcade Fire-Neighborhood #1 (Tunnels) This is a beautiful song that has something to do with snow,... http://tumblr.com/xi54taiao
TuckerFrancis (Tucker Francis) Sun, 20 Dec 2009 02:23:07 -0000
Audio: Arcade Fire-Neighborhood #1 (Tunnels) This is a beautiful song that has something to do with snow,... http://tumblr.com/xi54taiao
@alisonbrie hey that's where I work :) have fun! You should do a tour of the tunnels, that's where my office is!
NicoleLRoss (Nicole Ross) Sun, 20 Dec 2009 02:04:22 -0000
@alisonbrie hey that's where I work :) have fun! You should do a tour of the tunnels, that's where my office is!
Yo @BrookBR00T4L, i found your 12mm tunnels in my room haha, come to brin's on Wednesday and I'll bring them with me :)
ShahnLane (Shahn Lane) Sun, 20 Dec 2009 01:55:19 -0000
Yo @BrookBR00T4L, i found your 12mm tunnels in my room haha, come to brin's on Wednesday and I'll bring them with me :)
A General Report Upon the Initiation and Construction of the Tunnel Under the East River, New York - Facsimile of the 1894 book by Charles M. Jacobs.
Ancient Tunnels: From Roman Outlets Back to the Early Greek Civilization - Paper by Vittorio Castellani and Walter Dragoni which reviews more than twenty years of investigations devoted to hydraulic tunnels in ancient Mediterranean civilisations.
Bridge and Tunnel Centres - Full text of this 1875 book by John B. McMaster.
Chicago Tunnel Company - Illustrated history of the freight tunnels below the streets of downtown Chicago. Opened in 1906.
Meta Description: [ This site is about the Chicago Tunnel Company, which was a narrow gauge electric freight railroad that operated in 60 miles of tunnels under the streets of Chicago's Loop. ]
Hezekiah's Tunnel - Jerusalem - A collection of pictures of the tunnel taken in 1995. Includes historical facts, physical characteristics, and quotes from the Bible and other historical sources.
Hooac Tunnel Collection - Details of the documents collection held by the North Adams Public Library. Includes historical notes on the construction.
Hoosac Tunnel - Completed in 1875, the first tunnel in the US to use compressed air for drilling. Includes specifications, contemporary articles, and photographs.
Meta Description: [ This site is an anthology of 19th and early 20th century railroading. It is directed towards the enthusiast and civil engineer as well. ]
How the Swiss Built the Greatest Tunnel in the World - Short contemporary commentary by Francis Fox about the construction of the Simplon tunnel through the Alps completed in 1905.
Illustrations of Incidents in Tunnel Construction - Facsimile of the illustrated 1909 souvenir program to commemorate the fifth anniversary of the the joining of New York with New Jersey via the Hudson Tubes.
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London Transport History - Tunnelling - Illustrated commentary on tunnelling methods used in the 19th century.
Meta Description: [ London's Transport Museum's Timezone: A social history of London's public transport ]
Railway Tunnels Under the Hudson River - Illustrated article from the Scientific American published in 1891. Discusses the resumption of construction works.
Meta Description: [ This site is an anthology of 19th and early 20th century railroading. It is directed towards the enthusiast and civil engineer as well. ]
Report of the Superintendent of the Sutro Tunnel Company - Full text of this document providing detailed reports from the heads of department for the year ending 1873.
St. Clair Tunnel Company - Opened in 1891, running under the St. Clair River, which joins Lake Huron to Lake St. Clair. Includes short history, photographs, and references.
Standedge Tunnel - Construction history, restoration details and photo gallery of the longest, highest and deepest canal tunnel in Britain. First opened in 1811.
Meta Description: [ Standedge, tunnel, Huddersfield, narrow, canal, England, visitor, centre, interpretation, boat, trip ]
Sutro Tunnel - Facsimile of the letter from the Secretary of War, transmitting the report of the commission to examine and report upon the Sutro Tunnel, in Nevada. January 9, 1872.
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Sutro Tunnel - Facsimile of the 1872 report of the commissioners and evidence taken by the committee on mines and mining of the House of representatives.
Sutro Tunnel Company Collection - A guide to the papers collection held by the University of Nevada.
The Astoria Tunnel Under the East River for Gas Distribution in New York City - Text of this article by John Vipond Davies printed in the 1916 volume of the American Society of Civil Engineers Transactions.
The Hoosac Tunnel - Comprehensive range of commentary, data, history and construction images.
Meta Description: [ Hoosac Tunnel Website ]
The Making of the Channel Tunnel - A Modern Day Wonder - Text of the 1995 Gould Distinguished Lecture by John Neerhout, Jr. Describes the gestation period, ideas, plans, and efforts which spanned over two centuries.
The Mount Cenis Railway and Tunnel - Facsimile of illustrated article from Harpers magazine dated July 1871. Describes the operations of the first machine drill for tunnelling construction.
Meta Description: [ This site is an anthology of 19th and early 20th century railroading. It is directed towards the enthusiast and civil engineer as well. ]
The Severn Railway Tunnel - Extensive ten chapter history of the construction. Topics include highs and lows, tunnelling methods, and a collapse in the tunnel. Opened in 1886.
Meta Description: [ Great Western Railway, The Severn Railway Tunnel: Chapter 1 - A Tunnel or a Bridge ]
The Sutro Tunnel - Description of the tunnel on Nevada's Comstock Lode, taken from Sam P. Davis' 1912 History of Nevada.
Meta Description: [ Description of the Sutro Tunnel on Nevada's Comstock Lode, taken from Sam P. Davis' History of Nevada (1912) ]
The Thames Tunnel - Short illustrated history of the first tunnel to be built under a navigable river and the first to use a tunnel shield.
Meta Description: [ The award winning Brunel Museum housed in an ancient monument set in picturesque riverside gardens. An exhibition using new technology and spanning the career of both Marc Brunel and Isambard Kingdom Brunel featuring the Thames Tunnel and Great Eastern projects. ]
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The Tower Subway - Illustrated notes from the BBC on the construction and use of this subway built beneath the Thames in 1869.
Meta Description: [ BBC Beyond the Broadcast - booklets, video packs, audio packs, kits ]
The Tunnel of Eupalinos - Extensive illustrated article by Dan Hughes, with appendix by Hans J. Keller. Based on visits to the tunnel in 2000 and 2001.
The Tunnel of Samos - Illustrated scholarly essay which discusses the theories about the methods of construction of this ancient water tunnel built in the sixth century B.C.. By Tom M. Apostol.
The Union Canal Tunnel - Completed in 1827, the oldest existing transportation tunnel in the United States. Brief history from the Lebanon County Historical Society.
Tunneling Under the Hudson River - Facsimile of the 1885 illustrated book by S. D. V. Burr.
Tunnelling Against Time - Illustrated essay on the construction history of the Cascade mountains tunnel completed in 1929.
Tunnels Timeline - Details significant construction events from 500 BC to 2000 AD. Provided bt the American Society of Civil Engineers.
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