After the war, Kintetsu planned to construct a bypass line between Ishikiri Station and Morinomiya Station in order to alleviate congestion on the Kintetsu Nara Line, which had become serious due to housing development along the line, but some portions of the planned line overlapped the lines planned by other companies and Osaka City, because at around the same time the Keihan Electric Railway planned an extension between Owada Station (Osaka Prefecture) and Morinomiya Station and Osaka City planned an extension of the fourth line (the current the Chuo Line) up to Hanaten Station via Honmachi Station and Morinomiya.
戦後、近鉄は沿線の宅地開発が進み混雑が激しくなった近鉄奈良線の混雑緩和策として石切駅～森ノ宮駅間のバイパス線を計画するものの、同時期に京阪電気鉄道が大和田駅(大阪府)～森ノ宮間を、大阪市が4号線（現・中央線）を本町駅～森ノ宮経由で放出駅まで延伸する計画をそれぞれ立てたため、一部区間で重複することとなった。