 Apart from the JR Tōzai Line, this is the only other rail line to cross the Yodo River via tunnels (and the only subway line to do so).It is the only subway line to pass entirely outside the Osaka Loop Line, and the only subway line that does not have any connections to the Midōsuji Line, the Yotsubashi Line, or the Sakaisuji Line (the Nankō Port Town Line, which also has no connections to the Midōsuji or Sakaisuji lines, is an automated people mover system, not a subway line).It passes briefly outside Osaka city, with some of the vicinity of Taishibashi-Imaichi being in Moriguchi.