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Enjoy the Hitachi IGBT-VVVF sound of the new 30000 series trains on the Osaka Subway Midosuji Line. Trains from 31604 onwards have been changed from Mitsubishi to Hitachi IGBT. The asynchronous sound is similar to that of a hybrid SiC-equipped train, but when switching to synchronous mode, it produces a roaring sound similar to that heard in older IGBT trains. Sound quality level: ★★★☆☆ 3 *This is a personal rating. ↓Midosuji Line VVVF Variations • [Great sound♪] Osaka Municipal Subway Midosuji Line VVVF Variations! 2018