60 Minutes - 1906 San Francisco Trolley Film
Someone else on Rav did a nice job of hunting up further info, and she posted the following:
"Lots of extra historical info on this video that I found while looking this morning.
Background info on the film: http://www.sfgate.com/cgi-bin/blogs/stew/detail?entry_id=...
A high quality download option and great info in the comments, especially about why there seems to be so many cars in 1906: http://www.archive.org/details/TripDown1905
A similar film made after the earthquake, although not from a cable car as those systems were damaged in the earthquake:
The CBS link posted has the best version of the film (with no rolling frames.)"