The Osaka Metro Chūō Line (中央線, Chūō-sen) is a rapid transit system in Osaka, Japan, operated by Osaka Metro. 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), and in MLIT publications, it is written as Line No. 4 (Chūō Line) (4号線（中央線）). Station numbers are indicated by the letter C. Together with the through operation to the Keihanna Line, the two lines have a unified nickname "Yumehanna" (ゆめはんな). On 1 July 2005, Osaka City bought the Technoport Line (テクノポート線) from Cosmosquare to Osakakō of its subsidiary Osaka Port Transport System Co., Ltd. (大阪港トランスポートシステム), reducing fare to increase traffic. The section became a part of the Chūō Line, however is still owned by OTS. The Chūō Line is the only line to connect to all other railway lines operated by the Osaka Municipal Transportation Bureau, including the Nankō Port Town Line. From Wikipedia
