Kanmon Tunnel
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The Kanmon Railway Tunnel, the Kanmon Roadway Tunnel and the Shin-Kanmon Tunnel are undersea tunnels crossing the Kanmon Straits in western Japan.
[edit] Kanmon Railway Tunnel
The Kanmon Railway Tunnel (関門鉄道トンネル kanmon tetsudō tonneru) was the first undersea tunnel in Japan. It crosses the Kanmon Straits, connecting the islands of Honshū and Kyūshū of Japan. It is an important link in the rail transportation system in that country. Construction began in 1936 and freight service commenced operation in 1942. The Honshū-bound link has a length of 3,604 m and the Kyūshū-bound link measures 3,614 m. The gauge is 3 ft 6 in (1,067 mm) and the electric supply is 1500 VDC. Kyushu Railway Company assumed ownership of the line with the breakup of the JNR system in 1987.
[edit] Kanmon Roadway Tunnel
The Kanmon Roadway Tunnel (関門国道トンネル kanmon kokudō tonneru) carries National Route 2 under the Kanmon Straits. It opened in 1958. With an overall length of 3,461 m, it includes 780 m undersea. The endpoints are in Shimonoseki, Yamaguchi and Moji-ku, Kitakyushu, Fukuoka.
The Kanmonkyo Bridge is also available for the road traffic over the straits.
[edit] Shin-Kanmon Tunnel
The more modern Shin-Kanmon Tunnel (新関門トンネル shin-kanmon tonneru?) is 18,713 m long and carries the Sanyō Shinkansen under the same straits.
