Trolleybus
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.
Currently, around 300 trolleybus systems are in operation, in cities and towns in 43 countries. Altogether, more than 800 trolleybus systems have existed, but not more than about 400 concurrently.
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