transport in Delhi - trolleybus - 1
A trolleybus (also known as electric bus, trolley bus, trolley coach, trackless trolley, trackless tram or simply trolley) is a bus powered by two overhead electric wires, from which it draws electricity using two trolley poles. Two poles are required in order to accommodate the return current, which cannot pass to the ground as in the case of an electric tram or streetcar since trolleybuses use rubber tires, rather than steel wheels on rail. There are trolleybuses in many cities around the world.
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