muni's l taraval line opened as a shuttle from west portal to 33rd avenue on april 12, 1919. it went further west along taraval street to 48th avenue at ocean beach on january 14, 1923; that october 15, the shuttle service was replaced with larger streetcars running through to the ferry building. the l taraval went south (turning off taraval at 46th) to the san francisco zoo, the line's current outer terminus, on september 15, 1937. every other streetcar line was routed to the new transbay terminal on january 15, 1939; they went back to the ferry building on january 1, 1941, but the transbay terminal became the inner terminal for all streetcars on june 6, 1948.