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There is a few new information about what happened. According to different press releases of Deutsche Bahn and media reports tubbing segments were displaced on a length of approximately 130 ft behind the TBM's shield with ingress of soil and water. Sounds like a kind of zipper effect. The tunnel will be filled with concrete on a length of about 500 ft a total of about 130,000 cubic feet of concrete burying the TBM. To restore the mainline everything is taken out, a 400 ft long, 50 ft wide, and 3'-4'' thick concrete slab gets poured and the rails replaced. If they will restore the filled tunnel I don't know. Regards, Volker
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