The Sakaisuji Line (堺筋線, Sakaisuji-sen?) is an underground rapid transit line in Osaka, Japan, operated by the Osaka Municipal Subway. Its official name is Rapid Electric Tramway Line No. 6 (高速電気軌道第6号線?), while the Osaka Municipal Transportation Bureau refers to it as Osaka City Rapid Railway Line No. 6 (大阪市高速鉄道第6号線?), and in MLIT publications, it is written as Line No. 6 (Sakaisuji Line) (6号線（堺筋線）?). Station numbers are indicated by the letter K.
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