Given the fact that Kyoto Municipal Transportation Bureau has been chronically mired in red ink and Keihan Electric Railway has been in a business depression with regard to the Otsu Line, some people are still advocating an improvement in which Keihan Electric Railway would obtain qualification as a Type II Railway Business Operator and take over the subway facilities in a business-trust agreement in order to operate the Tozai Line integrally with the Keishin Line.
もっとも、京都市交通局事業の慢性赤字や開業後の京阪電気鉄道の大津線事業の不振という現状から、京阪電気鉄道が第二種事業免許を取得し、業務委託などの形で事実上譲り受け、京津線と一体運営すべきという改善案も今なお一部に存在する。