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The 8.8 km long Boßler Tunnel was tendered in 2012 as a NATM tunnel, although a variant with a tunnel boring machine (TBM) was permitted for the first 2,800 m of the tunnel from the north side. The joint venture Tunnel Albaufstieg ATA won the contract in a negotiation process with the variant TBM for the first 2,800 m. Out of the conviction that a large part of the Boßler Tunnel should be feasible...
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