Streetcar sighting in The Chinese Cat

About three-and-a-half minutes into the 1944 Charlie Chan movie The Chinese Cat, cab driver Birmingham Brown nearly swerves into the path of an oncoming streetcar when he discovers Charlie Chan is the passenger he's taking to the Francis Hotel. 

We briefly see the oncoming streetcar from Brown's point-of-view. Interestingly, these streamlined streetcars appear to be cable driven: you can see the slot in the road between the rails, and there's no overhead wiring straddling the street. The movie takes place in San Francisco, but if this footage was actually shot in San Francisco, I wonder where? It seems quite flat, and I didn't know they ran cable driven streamliners. I need to investigate.

[Update: Vince mentioned that maybe it isn't powered by a cable, but maybe by a conduit system. I don't know if SF had such a system. Maybe this was some convenient - and cheap - stock footage? Maybe some more investigation is needed?]