• Kyodo

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As the Seikan Tunnel — a rail link between Honshu and Hokkaido — marked the 30th anniversary of its opening on Tuesday, better coexistence between shinkansen services and freight traffic remains a key challenge.

At 53.85 km, the world’s longest undersea tunnel connects the northern tip of Honshu with Hokkaido. The tunnel, 23.3 km of which runs undersea, has been a major transport artery since its opening, as it is little affected by high winds and heavy snow.

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