The operation of the Keishin Line of Keihan Electric Railway and that of the Tozai Line of Kyoto Municipal Subway overlap between Sanjo (Keihan Sanjo) and Keihan-Yamashina; initially it was planned that the operation between Sanjo and Keihan-Yamashina on the Keishin Line would be discontinued and Keihan trains should run into the Tozai Line at Keihan-Yamashina, but it was deemed physically impossible to execute the plan, mainly because of the linearity problem of the Tozai Line (the Tozai Line was laid along the Kyoto Outer Loop Expressway in the north-south direction, and the Keishin Line of Keihan Electric Railway and the Tozai Line of Kyoto Municipal Subway were to cross one another at right angles), and therefore it was decided that the Keihan trains would run into the Tozai Line at Misasagi.
京阪電気鉄道京津線と京都市営地下鉄東西線との重複区間は、三条（三条京阪）～京阪山科（山科）間で、当初、京阪電気鉄道は、京津線の三条～京阪山科を廃止し、京阪山科から京都市営地下鉄東西線へ乗り入れる予定であったが、京都市営地下鉄東西線の線形（京都府道外環状線を北上し、京阪電気鉄道京津線と十字に交差）の問題などの理由から物理的に不可能となり、御陵に変更された。