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An employee of AlpTransit Gotthard Ltd and a visitor stand at the NEAT Gotthard Base tunnel near Erstfeld

An employee of AlpTransit Gotthard Ltd and a visitor stand at the NEAT Gotthard Base tunnel near Erstfeld May 7, 2012. 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) - RTR31QCQ

World's longest train tunnel

Switzerland is building in the NEAT Gotthard Base tunnel, which is the world’s longest train tunnel, with 35-mile long parallel tracks crossing the Alps. The tunnel should become operational at the end of 2016.