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Mini-shinkansen
is the name given to the concept of converting narrow gauge railway lines to standard gauge for use by Shinkansen train services in Japan. Two mini-shinkansen routes have been constructed: the Yamagata Shinkansen and Akita Shinkansen.
==Concept==
The Mini-shinkansen concept was first developed in JNR days, but was not formally proposed until November 1987, following the formation of East Japan Railway Company (JR East). The concept involved regauging existing gauge lines to standard gauge and linking them to the Shinkansen network to allow through-running. While the track gauge was widened, the loading gauge remained unchanged, requiring the construction of new shinkansen trains with a narrower cross-section. These would be capable of running at high-speed (the E6 series trains have a maximum speed capability of 320 km/h) on Shinkansen tracks, either on their own or coupled to full-sized sets, and run at conventional narrow-gauge speeds (around 130 km/h) on the mini-shinkansen tracks. Speeds on converted lines would also be raised where possible.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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