description Seikan Tunnel Overview
Beneath Japan's Tsugaru Strait, the Seikan Tunnel provides a railway connection between Honshu and Hokkaido. Its 53.85-kilometre route opened in 1988, giving the islands a transport link less exposed to the harsh maritime weather that affected ferry crossings. A substantial part of the passage runs beneath the seabed, placing it among the world's longest undersea railway tunnels. Dual-gauge track accommodates standard-gauge Hokkaido Shinkansen trains and narrow-gauge freight traffic.
This shared use distinguishes Seikan from tunnels dedicated solely to high-speed passenger services. For railway enthusiasts and people interested in civil engineering, its defining feature is the combination of a long underwater crossing with the practical task of carrying different types of trains through the same infrastructure.
help Seikan Tunnel FAQ
Which two Japanese islands are connected by the Seikan Tunnel?
The Seikan Tunnel is a 53.85-kilometre railway tunnel that connects Japan's main island of Honshu with the northern island of Hokkaido. It spans directly beneath the rough waters of the Tsugaru Strait.
Is the Seikan Tunnel entirely located underwater?
While it is famous as an undersea tunnel, a significant portion of it runs deep underground beneath the landmasses of both islands. Approximately 23.3 kilometres of the tunnel's total length lies directly beneath the seabed of the Tsugaru Strait.
When was the Seikan Tunnel officially completed and opened for use?
The tunnel officially opened for railway service in 1988 after nearly 25 years of grueling, dangerous construction. It was built to provide a reliable, weather-independent transportation link unaffected by the harsh maritime conditions that frequently sank ferries.
Can passengers ride the high-speed Shinkansen trains through the Seikan Tunnel?
Yes, the Hokkaido Shinkansen high-speed rail line utilizes the Seikan Tunnel to travel from Honshu to Hokkaido. The tunnel's dimensions were specifically designed with the future implementation of the Shinkansen network in mind.
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