The Chūō Line (大阪市営地下鉄中央線 Ōsaka-shiei-chikatetsu Chūō-sen) is a rapid transit system in Osaka Japan operated by the Osaka Municipal Subway. The line runs east-westerly under Chūō Avenue (中央大通 Chūō Ōdōri). Its official name is Rapid Electric Tramway Line No. 4 (高速電気軌道第4号線) while the Osaka Municipal Transportation Bureau refers to it as Osaka City Rapid Railway Line No. 4 (大阪市高速鉄道第4号線) and in MLIT publications it is written as Line No. 4 (Chūō Line) (4号線（中央線）).
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