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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“If the Union is once severed, the line of separation will grow wider and wider, and the controversies which are now debated and settled in the halls of legislation will then be tried in fields of battle and determined by the sword.”
—Andrew Jackson (1767–1845)