| a passenger bus operating on tires and having an electric motor that draws power from overhead wires. |
| trolley bus n. An electric bus that does not run on tracks and is powered by electricity from an overhead wire. |
trolley bus
vehicle operated on the streets on rubber tires and powered by electricity drawn from two overhead wires by trolley poles. It is distinct from a trolley car, which runs on rails rather than on tires and is thus a form of streetcar.
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