Trolleybus

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A trolleybus (also known as trolley bus, trolley coach, trackless trolley, trackless tram or trolley) is an electric bus that draws its electricity from overhead wires (generally suspended from roadside posts) using spring-loaded trolley poles. Two wires and poles are required to complete the electrical circuit, unlike a tram or streetcar, which normally uses the track as part of the electrical path and thus needs only one wire and pole.

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