During World War II, a connecting line was provided between the Keishin Line and the Higashiyama Line, where freight trains for night-soil transportation entered the Keishin Line from the line of the Kyoto City Trams during and after the war.
この東山線との間には、第二次世界大戦中に連絡線が設けられ、戦中戦後には市電側から屎尿輸送の貨物電車が京津線に乗り入れた。