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ENR > Transportation > Alpine Tunneling Is Swift So Far As Crews Probe For Unstable Rock
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| Switzerland's intent to force road vehicles onto the railroads will relegate the 1913 Lötschberg Alpine rail tunnel, built with pneumatic drills and hand shovels, to a secondary role. Crews building the 34.8-kilometer route that will supersede it now utilize jumbos and tunnel boring machines. But uncertain, variable geology that led to numerous ...
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