Assertion: controlled passive tilt | /r/HasProperty | 制御付き自然振子式
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text: During the final years of the Japanese National Railways, experimentation on mechanically-regulated passive tilt - a combination known as 'controlled passive tilt' (制御付き自然振子式), where tilt is initiated passively but controlled (and slowed down) by computers through mechanical active suspension - culminated post-privatisation with the 2000 series DMU, built for JR Shikoku and introduced on the Shiokaze and Nanpū limited express services in 1990.