>Oops. It apears that cable car have the cable below them. I could have sworn I've seen a mechanical "hand" come out the top and grab an over head cable.

I don't know if the words "trolley", "streetcar", "cablecar", and "tram" have strict definitions, or if they are just preferences in different cities. "Cablecar" may refer to a car on rails that is hauled by the cable, not powered by it. For some people "trolley" implies a streetcar that has that old-fashioned San Francisco boxy shape, with railings. Those dumb tourbusses that are shaped that way are sometimes called a "trolley bus". I think of a "tram" as a long, enclosed European-style car, resembling a train car. These are used in San Francisco and I don't know what they call them. They also use busses with tires and a regular bus-shape, but powered from an overhead electrical cable like the trolley. In SF the trams, electrical busses, busses, and the old-fashioned trolley that runs through Chinatown are collectively called MUNI, which is separate from BART (the subway).