Subsequently, due to problems concerning the route of the Tozai Line near Yamashina, it became physically impossible for trains of the Keishin Line coming from the direction of Hamaotsu to connect to the Tozai Line at Yamashina, and thus the related parties decided to adopt the idea of newly establishing the subway Misasagi Station as a connection station of the Keishin Line and the Tozai Line, doing so in the section between Hinooka and Misasagi, which was running along Sanjo-dori Street, and thus to move Misasagi Station of the Keishin Line underground.
その後、東西線の山科付近のルートの都合で、浜大津方面から京津線の山科での乗り入れは物理的に不可能となり、京津線と東西線との接続駅として、三条通を走る日ノ岡～御陵間に地下鉄御陵駅を新設し、ここに京津線の御陵駅を移設・地下化することに決まった。