description Daishimizu Tunnel Overview
The Daishimizu Tunnel is a 22.2-kilometer railway tunnel on the Joetsu Shinkansen line in Japan, traversing the mountainous border between Gunma and Niigata prefectures. Upon its opening in 1982, the massive infrastructure project became one of the longest land tunnels in the world, enabling high-speed rail travel to bypass the steep topography of the region. The structure remains a critical component of the Japanese bullet train network, significantly reducing travel times between Tokyo and Niigata.
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How long is the Daishimizu Tunnel?
The Daishimizu Tunnel is approximately 22.2 kilometres long, making it one of Japan's longest railway tunnels at the time it opened. It was the longest land tunnel in Japan until surpassed by later projects.
What railway line uses the Daishimizu Tunnel?
The Daishimizu Tunnel carries the Joetsu Shinkansen, the high-speed rail line connecting Tokyo and Niigata operated by JR East. It bores through the mountainous border between Gunma and Niigata prefectures.
When did the Daishimizu Tunnel open?
The Daishimizu Tunnel opened in 1982 as part of the inaugural Joetsu Shinkansen line. The tunnel's completion was a major engineering milestone that enabled high-speed rail service between the Sea of Japan coast and Tokyo.
Where is the Daishimizu Tunnel located?
The Daishimizu Tunnel runs through the mountains on the Gunma–Niigata prefectural border in central Japan. It forms a critical section of the Joetsu Shinkansen route across the mountain spine of Honshu.
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