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The first train comes out of the tunnel's North portal while fireworks mark the official opening on the opening day of the Gotthard rail tunnel, the longest tunnel in the world, at the North portal near Erstfeld, Switzerland, Wednesday, June 1, 2016. The construction of the 57 kilometer long tunnel began in 1999, the breakthrough was in 2010. After the official opening on June 1, the commercial opperation will commence on December 2016. (KEYSTONE/Laurent Gillieron)