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Related to trackless trolley: Trolleybuses
A trolley bus.
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|Noun||1.||trackless trolley - a passenger bus with an electric motor that draws power from overhead wires|
autobus, bus, charabanc, double-decker, jitney, motorbus, motorcoach, passenger vehicle, omnibus, coach - a vehicle carrying many passengers; used for public transport; "he always rode the bus to work"
electric motor - a motor that converts electricity to mechanical work