Construction trains in the eastern tube of the Gotthard Base Tunnel, August 28, 2004.
The Gotthard Base Tunnel is a railway tunnel under construction in Switzerland. With a planned length of 57 km (35 miles) and a total of 153.5 km (95 mi) of tunnels, shafts and passages planned, it will be the longest railway tunnel in the world upon completion in 2015, ahead of the current longest, the Seikan Tunnel. The project is designed to feature two separate tunnels containing one track each.
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