As a result of the negotiation with administrative agencies and other relevant institutions, the company concluded a joint-operation agreement with Kyoto City, and based on that agreement the routes of Kumogahata, Kamikuroda, Ohara and Tochu were extended to Sanjo-Keihan in 1950 and the routes of Ohara and Tochu were further extended to Shijo-dori Omiya-dori in 1952.
そこで行政官庁や関係各機関に働きかけ続けた結果、京都市との共同運行協定を締結し、1950年に雲ヶ畑・上黒田・大原・途中の各線が三条京阪まで乗り入れ、続いて1952年に大原・途中の各線は四条通大宮通まで乗り入れた。