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. (Photo by Fabrice Coffrini/AFP Photo)





Artists perform during the opening show directed by German director Volker Hesse, on the opening day of the Gotthard rail tunnel, the longest tunnel in the world, at the fairground in Pollegio, Switzerland, Switzerland, 01 June 2016. The construction of the 57 kilometer long tunnel began in 1999, the breakthrough was in 2010. After the official opening on 01 June, the commercial opperation will commence on December 2016. (Photo by Alexandra Wey/EPA)





Artists perform during the opening show directed by German director Volker Hesse, on the opening day of the Gotthard rail tunnel, the longest tunnel in the world, at the fairground at the southern portal in Pollegio, Switzerland, 01 June 2016. (Photo by Samuel Golay/EPA)





Artists perform during the opening show directed by German director Volker Hesse, on the opening day of the Gotthard rail tunnel, the longest tunnel in the world, at the fairground at the southern portal in Pollegio, Switzerland, 01 June 2016. (Photo by Gabriele Putzu/EPA)





Performers dressed as miners, take part in a show during the opening ceremony of the NEAT Gotthard Base Tunnel, the world's longest and deepest rail tunnel, near the town of Erstfeld, Switzerland June 1, 2016. The 57.1-km (35.5 mile)-long Gotthard Base Tunnel, 17 years under construction and designed to last a century, is part of a 23 billion Swiss franc (23.1 billion USD) infrastructure project to speed passengers and cargo by rail below the Alps, as much as 2.3 km (1.7 miles) under the mountain chain, that divides Europe's north and south. (Photo by Arnd Wiegmann/Reuters)





The old Gotthard diligence seen during the opening show directed by German director Volker Hesse, on the opening day of the Gotthard rail tunnel, at the fairground Rynaecht at the northern portal in 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 operation will start in December 2016. (Photo by Peter Klaunzer/Pool Photo via AP Photo)





Artists perform during the opening show directed by German director Volker Hesse, on the opening day of the Gotthard rail tunnel, the longest tunnel in the world, at the fairground at the southern portal in Pollegio, Switzerland, 01 June 2016. (Photo by Gabriele Putzu/EPA)





Performers dressed as miners, take part in a show during the opening ceremony of the NEAT Gotthard Base Tunnel, the world's longest and deepest rail tunnel, near the town of Erstfeld, Switzerland June 1, 2016. The 57.1-km (35.5 mile)-long Gotthard Base Tunnel, 17 years under construction and designed to last a century, is part of a 23 billion Swiss franc (23.1 billion USD) infrastructure project to speed passengers and cargo by rail below the Alps, as much as 2.3 km (1.7 miles) under the mountain chain, that divides Europe's north and south. (Photo by Ruben Sprich/Reuters)





A stagecoach pulled by horses takes part in a show during the opening ceremony of the NEAT Gotthard Base Tunnel, the world's longest and deepest rail tunnel, near the town of Erstfeld, Switzerland June 1, 2016. (Photo by Arnd Wiegmann/Reuters)





Artists perform during the opening show directed by German director Volker Hesse, on the opening day of the Gotthard rail tunnel, at the fairground Rynaecht at the northern portal in Erstfeld, Switzerland, Wednesday, June 1, 2016. (Photo by Ruben Sprich\Pool Photo via AP Photo)





Performers dressed as miners, take part in a show during the opening ceremony of the NEAT Gotthard Base Tunnel, the world's longest and deepest rail tunnel, near the town of Erstfeld, Switzerland June 1, 2016. The 57.1-km (35.5 mile)-long Gotthard Base Tunnel, 17 years under construction and designed to last a century, is part of a 23 billion Swiss franc (23.1 billion USD) infrastructure project to speed passengers and cargo by rail below the Alps, as much as 2.3 km (1.7 miles) under the mountain chain, that divides Europe's north and south. (Photo by Ruben Sprich/Reuters)





The first train comes out of the tunnel's North portal on the opening day of the Gotthard rail tunnel, at the North portal near Erstfeld, Switzerland, Wednesday, June 1, 2016. (Photo by Laurent Gillieron/Keystone via AP Photo)





Happy winners of tickets for the first train through the Gotthard tunnel enjoy their trip from Arth-Goldau to Bellinzona, Switzerland, on the opening day of the Gotthard rail tunnel, the longest tunnel in the world, 01 June 2016. (Photo by Christian Beutler/EPA)





Guests waves at a train that has crossed the tunnel during the opening ceremony of the NEAT Gotthard Base Tunnel, the world's longest and deepest rail tunnel, near the town of Erstfeld, Switzerland June 1, 2016. (Photo by Arnd Wiegmann/Reuters)