How they work - what's happening out of sight on the San Francisco Cable cars?

Here's a more in-depth look at the workings of San Francisco's unique cable cars. What goes on below the slot - how does the cable stay in tension and how does the grip work?

I've already looked at the history and taken a ride in this film https://youtu.be/QtFpFHuy6D0

This is a closer look at the technology developed in the 1870s and 1880s which keeps them moving for the delight of tourists from all over the world.

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