During the 1920's did the San Francisco bay area have a mass transportation system that allowed riders to travel over the bay bridge and down to the south bay?

Interesting question. They had a ferry boat system that would take them across from Oakland and I think a bus system would have taken riders to the south bay. The light rail and BART systems are pretty recent. Even as a kid going to San Francisco I remember my mom pointing out the ferry/bus/cable system the city had. Of course, the south bay area wasn't as built up in 1920's as it is today and the airport wouldn't have been there yet. I imagine the need to get to the south bay wasn't very great. By-the-way I don't think the Bay bridge would have been built yet either. I remember seeing pictures in books of the building of it in the 30's or early 40's.