Mini-shinkansen 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. Unlike the high-speed shinkansen lines, the mini-shinkansen lines have a maximum speed of only. 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 . 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 on Shinkansen tracks, either on their own or coupled to full-sized sets, and run at conventional narrow-gauge speeds on the mini-shinkansen tracks. Speeds on converted lines would also be raised where possible.The first mini-shinkansen route to be built was the Yamagata Shinkansen, converted from the 87.1 km section of the Ōu Main Line between Fukushima on the Tohoku Shinkansen and Yamagata in Yamagata Prefecture . Work started in 1988, with Yamagata Shinkansen services commencing on 1 July 1992 . Services were operated by a new fleet of 400 Series Shinkansen trains, at up to 240 km/h on the Tōhoku Shinkansen and 130 km/h on the Yamagata Shinkansen section. The success of this initiative led to the conversion of a further 61.5 km of the line to, opening on 4 December 1999 .Akita Shinkansen Following the success of the Yamagata Shinkansen conversion, a scheme was proposed to construct a second mini-shinkansen route from Morioka in Iwate Prefecture , then the northern terminus of the Tohoku Shinkansen, with Akita in Akita Prefecture . This involved regauging the 75.6 km Tazawako Line from Morioka to Ōmagari and 51.7 km of the Ōu Main Line from Ōmagari to Akita. This opened on 22 March 1997 with Komachi services using new E3 Series Shinkansen trains. On 16 March 2013, E6 series trains entered service on this line, initially at a maximum speed of 300 km/h on the Tohoku Shinkansen section. In March 2014 , the maximum speed on the Tohoku Shinkansen was increased to 320 km/h.Rolling stock The following rolling stock was built for use on mini-shinkansen lines. 400 Series Shinkansen , Yamagata Shinkansen E3 Series Shinkansen , Akita Shinkansen and Yamagata Shinkansen E926 East i track and overhead wire inspection train E955 Fastech 360Z experimental test train E6 Series Shinkansen , introduced on the Akita Shinkansen in March 2013
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