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World's longest railway tunnel, Gotthard Base Tunnel, Switzerland

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World's longest and deepest tunnel opens

Gotthard Base Tunnel, world's longest and deepest rail tunnel

Elasticity for the slab track in the Gotthard Base Tunnel

Gotthard Tunnel:World's longest railway tunnel opens in Switzerland

Gotthard Base Tunnel: the Longest Railway Tunnel in the World

Gotthard Base Tunnel: Construction Features of the World's Longest

Gotthard tunnel: World's longest and deepest rail tunnel opens in

Gotthard: the world's longest railway tunnel officially opens

Gotthard base tunnel in numbers - Times of India

Challenges of the design and construction at the Gotthard base