The longest railway tunnel in the world is __________.

Marmaray (Turkey)

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Tunnel of Love (Ukraine)

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Gotthard base Tunnel (Switzerland)

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Channel Tunnel (UK)

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Solution

The correct option is A Gotthard base Tunnel (Switzerland)
The world's longest and deepest rail tunnel has officially opened in Switzerland, after almost two decades of construction work. The 57km (35-mile) twin-bore Gotthard base tunnel will provide a high-speed rail link under the Swiss Alps between northern and southern Europe.

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