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Osaka Municipal Subway Chuo Line 20 series 01, which was introduced in 1984, is the first AC induction motor/VVVF inverter controlled vehicle in Japan (excluding streetcars). Due to aging, it will be retired on August 21, 2014, and will be operated with a "Goodbye Head Mark" from July 24. http://www.kotsu.city.osaka.lg.jp/gen... This train will be replaced by 24 series 56, which was transferred from the Yotsubashi Line to the Chuo Line. The GTO thyristor elements originally installed were replaced with Hitachi IGBT elements in 1994 to increase the maximum speed (70 to 95 km/h: the fastest in Japan for third rail) following the opening of the Kintetsu Keihanna Line extension. Osaka Municipal Subway 20 series on Chuo Line. http://en.wikipedia.org/wiki/Ch%C5%AB...)