In this October 8, 2015 file photo a test train drives close to the northern gate near Erstfeld, Switzerland. The celebrations of the opening of the Gotthard Base Tunnel will start on June 1, 2016. With a length of 57 km (35 miles) crossing the Alps, the Gotthard Base tunnel is the world's longest train tunnel. (Photo by Urs Flueeler/Keystone via AP Photo)
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