Artists perform during a show on the ope

Artists perform during a show on the ope

Artists perform during a show on the opening day of the Gotthard rail tunnel at the fairground Rynaecht at the northern portal in Erstfeld, Switzerland, on June 1, 2016.
The new Gotthard Base Tunnel (GBT) is set to become the world’s longest railway tunnel when it opens on June 1. The 57-kilometre (35.4-mile) tunnel, which runs under the Alps, was first conceived in sketch-form in 1947 but construction began 17 years ago. / AFP PHOTO / FABRICE COFFRINIFABRICE COFFRINI/AFP/Getty Images

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