On track at last: construction of the Brenner Base Tunnel picks up speed - Railway Technology
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/34/22/3422bebe-7318-4aae-a302-02c9e48c9ad8/nov2016_h09_phenom.jpg "Beneath a Mountain in Switzerland Lies the World's Longest Shortcut | Travel| Smithsonian Magazine")
Beneath a Mountain in Switzerland Lies the World's Longest Shortcut | Travel| Smithsonian Magazine
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Gotthard Base Tunnel, World's Longest, Deepest Tunnel, Is Officially Open In Switzerland : The Two-Way : NPR
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Gotthard base tunnel Switzerland by Niedax « Inhabitat – Green Design, Innovation, Architecture, Green Building
Governors protest latest delay to Brenner Base Tunnel construction - International Railway Journal
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World's longest tunnel a day away from seeing the light
Gotthard Base Tunnel - Longest and deepest tunnel in the world
Caterpillar Base Plate with Carabiner
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Brenner Base Tunnel - Wikipedia
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