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Summary Of: Tunnels
in general tunnels are at least twice as long as they are wide... Some tunnels are not for transport at all but are fortifications... Tunnels are dug in various types of materials... Shallow tunnels are often of the cut... where bored tunnels were used for stations and passenger access... This technique is commonly used to create tunnels under existing structures... crossing tunnels built instead of bridges include the... made tunnels created to carry two or more utility lines underground... s oldest railway tunnels lying below streets... one of the first longer road tunnels under a pass... is one of the busiest vehicular tunnels in the world... of tunnels designed to reduce flooding in the... The use of tunnels for mining is called... For more information regarding tunnels built by animals... Encyclodia Page On: Tunnels
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