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The Kanmon Railway Tunnel (関門鉄道トンネル, kanmon tetsudō tonneru) was the first undersea tunnel in Japan. It goes underneath the Kanmon Straits, connecting the islands of Honshu and Kyushu.[1] It is an important link in the Japanese rail network. Its construction began in 1936, and it was completed in November 1942, during the Pacific War. The Honshu-bound tunnel is 3,604 m (11,824 ft) long, the Kyushu-bound tunnel is 3,614 m (11,857 ft). Track gauge is 1,067 mm (3 ft 6 in) (Cape gauge), and its electric power supply is at 1,500 voltsDC.
