The Yamagata Shinkansen is a JR East-operated 'mini-shinkansen' line, connecting Tokyo Station and Shinjo Station in Yamagata Prefecture.
The trains actually use the tracks of the Tohoku Shinkansen and Ou Honsen line. It is referred to as a 'mini-shinkansen' due to the fact that it shares tracks with those regular trains.
The term 'Yamagata Shinkansen' essentially refers to the Ou Honsen section between Yamagata Station and Shinjo.
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