Once upon a time, from 1900 to about 1935, they were the kings of NYC streets. But then, they were driven out by a relentless government campaign to replace them with cars and ...
http://www.forgotten-ny.com/TROLLEYS/Trolley%20homepage/trol ...

Unlike rail vehicles (where side tracks are not available), an out-of-service vehicle can be removed to the side of the road and its trolleys disconnected, allowing vehicles to pass
http://en.wikipedia.org/wiki/Trolleybus

Trolley service for weddings, proms, corporate transportation, special events, and custom tours.
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Modern trolleys often do not use a trolley wheel: either they have a metal shoe with a carbon insert or they dispense with the trolley pole completely and have instead a pantograph.
http://en.wikipedia.org/wiki/Trolleys

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