Osaka Metro Line 9

Line 9's planned route is in the southern part of Osaka city (specifically, Suminoe-ku, Sumiyoshi-ku, Higashisumiyoshi-ku, and Hirano-ku).

Despite the high volume of road traffic, it has relatively inconvenient east-west mass transit compared to other parts of Osaka: most buses divert from the route at Sentai or Nagai, requiring several transfers to go any significant distance.

In the 10th report of the Transport Policy Committee in 1989, it was listed as a "route to be considered for future construction" (今後整備を検討すべき路線), but it was not included in the list of "mid-long-term prospective new lines to build out the railway network" (中長期的に望まれる鉄道ネットワークを構成する新たな路線) in the October 2004 report of the Kinki Regional Transport Committee.

With both Osaka and its Municipal Transportation Bureau being in the middle of a very tight financial situation, the planned southern extension of the Imazatosuji Line has been postponed indefinitely; under these conditions, it seems unlikely that another line passing completely outside the city center, without any major passenger draw along its route, and with little foreseeable demand outside of morning and evening rush hour, will stand much chance of completion in the near-term.

Furthermore, as the Municipal Transportation Bureau was privatized in 2017, it is possible that its ultimate fate will be decided by Osaka Rapid Electric Tramway, K.K.