Thursday, November 24, 2011

How to build world's longest train tunnel

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Zurich, Switzerland (CNN) -- The Alps are a vast natural barrier to movement between countries including Germany and Italy -- forcing cargo freights and travelers alike on winding detours through their rocky expanse. But negotiating the mountain range will soon become quicker and easier because of an incredible feat of engineering. The world's longest railway tunnel -- the "Gotthard Base Tunnel," (GBT) in Switzerland -- is in its last phase of construction. The GBT spans a route length of

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