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A tunnel boring machine used to excavate the Gotthard Base Tunnel the world s longest rail tunnel A tunnel boring machine that was used at Yucca Mountain nuclear waste repository A tunnel boring machine TBM also known as a mole is a machine used to excavate tunnels with a circular cross section through a variety of

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A tunnel boring machine 130 feet below street level in the 63rd Street subway tunnel construction site in New York in 1980 The 98 foot long 900 000 pound machine cost $4 million to build The Robbins Company of Seattle Washington built it with the cutting head supplied by the Westinghouse Co of Sunnyvale Calif

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