Please Donate 70 years ago the Parkside celebrated public transporation to the zoo. L - Taraval Extension Mayor Angelo Rossi, center, and Parkside residents celebrate at 46th Avenue and Taraval, September 15, 1937., 1937 - On September 15, 1937, after five years of lobbying by neighborhood residents, the L-Taraval line was extended to turn on 46th Avenue and reach all the way to the Fleishhacker Playground, today's San Francisco Zoo. Mayor Angelo Rossi, continuing the tradition begun by predecessor "Sunny Jim" Rolph, acted as motorman for the first streetcar on the new tracks. Neighborhood leaders from the Parkside District, such as Ray Schiller, Ed Haughy, and Mabel Powell joined him onboard to celebrate.