Check out the Cable Car Museum next time you are in San Francisco. This is just one of some wonderful historical attractions. This one is free and you can learn about the history of the cable cars.
These huge engines and winding wheels pull the cables for the cars.
Other devices used throughout the history of these cable cars, historical old cable cars, and photos from the Earthquake and Fire of 1906 are displayed as well. Ring an actual cable car bell...
Underneath the street the grip and die plays an important part in how cable cars work.