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An engineer sits on the special train 'Helvetia' in the NEAT Gotthard Base tunnel near Erstfeld

An engineer sits on the special train 'Helvetia' in the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012. The train, which is 481 metres (1578 ft) long and weighs 787 tons, is constructed to produce concrete for the installation of the railway tracks in the tunnel. Crossing the Alps, the world's longest train tunnel should become operational at the end of 2016. The project consists of two parallel single track tunnels, each of a length of 57 km (35 miles) REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: BUSINESS CONSTRUCTION EMPLOYMENT TRAVEL)

World's longest train tunnel

April 4, 2013

Switzerland is building in the NEAT Gotthard Base tunnel, which is the world’s longest train tunnel, with 57 km long parallel tracks crossing the Alps. The tunnel should become operational at the end of 2016.