A trolleybus -LRB- also known as trolley bus , trolley coach , trackless trolley , trackless tram or trolley -RRB- is an electric bus that draws its electricity from overhead wires -LRB- generally suspended from roadside posts -RRB- using spring-loaded trolley poles .

A trolleybus -LRB- also known as trolley bus , trolley coach , trackless trolley , trackless tram or simply trolley -RRB- is a bus , which get its power for the electric engine from a pair of powerlines , which is above the street .
