how long is the longest train tunnel in the world（関連順）

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World's longest train tunnel opens under Swiss Alps

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Keeping the world's longest railroad tunnel safe

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Never Missing A Train Again 🚆

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This magnetic bullet train in Japan can reach 375 mph! 🚅

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Designed in 1947 world's longest train tunnel opens today

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結果 : how long is the longest train tunnel in the world