Mini-shinkansen

Mini-shinkansen (ミニ新幹線?) is the name given to the concept of converting 1,067 mm (3 ft 6 in) narrow gauge railway lines to 1,435 mm (4 ft 8 1⁄2 in) standard gauge for use by Shinkansen train services in Japan. Two mini-shinkansen routes have been constructed: the Yamagata Shinkansen and Akita Shinkansen.

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High-speed Rail In Japan - Future - Mini-Shinkansen
... Mini-shinkansen (ミニ新幹線?) is the name given to the routes where former narrow gauge lines have been converted to standard gauge to allow Shinkansen trains to travel to cities without ... Two mini-shinkansen routes have been constructed the Yamagata Shinkansen and Akita Shinkansen ... Whilst no further Mini-shinkansen routes have been proposed to date, it remains an option for providing Shinkansen services to cities on the narrow gauge network ...