Following the opening of the Tokaido Shinkansen between Tokyo and Osaka in 1964, Japanese National Railways (JNR) focused on the development of faster Maglev technology. In the 1970s, a test track for Maglev research and development was built in Miyazaki Prefecture. As desired results had been obtained at the (now former) Miyazaki test track, an 18.4 kilometer test track with tunnels, bridges and slopes was built at a site in Yamanashi Prefecture, between Ōtsuki and Tsuru (). Residents of Yamanashi Prefecture and government officials were eligible for free rides on the Yamanashi test track, and over 200,000 people took part. Trains on this test track have routinely achieved operating speeds of over 500 km/h (310 mph), making this an embryonic part of the future Chuo Shinkansen.