They mix.
A little chronology of the San Francisco cable car, at this site. Notice the rapid deployment and immediate productivity gains in replacing the horse in San Francisco.
But, the Intelligent version of the cable car can travel 300 feet autonomously. Then, cities can put more cables in, more cheaply, in a more ad hoc fashion. The cable car that works can cable hop.
So, these cable trolleys, that hop between separate "in ground" cable pulls, have the ability to travel 300 feet, under wire control. Then they can match velocities with the cable, eliminating mechanical stress, they can pull over easily, get through intersections with minimal capital investment. Advanced cable technology should be able to pull a car 50 MPH, sort of fling the thing. Total mass flung is minimized.
Which brings us to the Airport Connector in Oakland. Use in ground cable, street level along the route. Then the problem reduces to one equivalent to the laying of sewer pipe. Or develop suspended cable pull technology, the cable car reaching up to grab a mechanical pull. Then the problem reduces to one of stringing power line. Using great cable pull technology, one then develops E Cable, the intelligent cable hopping using standard E traffic products.
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