World's Longest Train Tunnel, 世界上最長的鐵路隧道

Swiss police officers stand beside of mock gates of the NEAT Gotthard Base Tunnel inside the event hall for the upcoming opening ceremony near the town of Erstfeld, Switzerland May 31, 2016. (Photo by Arnd Wiegmann/Reuters)

A general view shows the northern gates (L) of the NEAT Gotthard Base Tunnel near the town of Erstfeld, Switzerland May 31, 2016. (Photo by Arnd Wiegmann/Reuters)
World's Longest Train Tunnel
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