Tunnels

http://actu.epfl.ch/news/fast-moving-floods-threaten-tgv-train-lines-5/

Underground transport infrastructure is extremely expensive, and usually comprises the bulk of expense for any high-speed railway through mountainous or rolling terrain. Nevertheless, there is reason to believe the estimate of $75 million per bore-kilometre used in AECOM13 is excessively high. In this post we will look at a rangeā€¦

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