Gotthard tunnel – DW – 06/01/2016
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The NRLA is complete with the opening of the Ceneri Base Tunnel
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World's Longest Rail Tunnel Enters Service in Switzerland
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Gotthard Base Tunnel - Longest and deepest tunnel in the world
The Gotthard Base Tunnel project receives the 2018 European Railway Award
Gotthard Base Tunnel Opens In Swiss Alps Becoming The World's Longest Tunnel | HuffPost UK News
Gotthard Base Tunnel - Wikipedia
Base tunnel - Wikipedia
World's longest railway tunnel, Gotthard Base Tunnel, Switzerland | AFRY
Gotthard Base Tunnel - Wikipedia
