The other two lines are more interesting. Firstly they have single ended cars which have to be turned at each terminus. Here we see the crowds queueing round the turntable (manually operated, of course) ...
Both these routes climb a lot more steeple than the California Street line, as we shall see. But part way up the hill the two lines cross at right angles.
The answer is that the grip (vernacular for the driver the driver) who works the grip (pliers) has to release the grip (grip) on the cable and coast through the crossing and then re-grip (grip again) afterwards. The grip (driver) has to grip the grip lever and the brake lever and work the two together to make things run smoothly.
Anyway, it is the two Powell routes that have the most spectacular hills.