This is a nice follow up to the film clip of a ride on a 1906 Key Route System line. It shows a number of Key Route and Interurban Electric Railway (IER) trains in locations you are sure to recognize, including the Bay Bridge and Treasure Island. It provides a good sense of what a rich transportation network was in place before autos finally pushed mass transit into the background. While the film doesn’t go into much detail, it also touches on the provisional railway that was fashioned from discarded parts used to transport workers to the Richmond shipyards during the war. Last but not least, there are some nice shots of Treasure Island in its heyday.
You can find some interesting stills of the Key System on this excellent site.