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| | Trolleybus - Wikipedia, the free encyclopedia |
 | | Some cities, led by the Brooklyn-Manhattan Transit Corporation (BMT—New York), subscribed to the all-four concept of using buses, trolleybuses, trams (in U.S. called streetcars, trolleys or light rail) and rapid transit subway and/or elevated lines (metros) as appropriate for routes ranging from lightly-used to heaviest trunk line. |
 | | New trolleybus near Harvard Square, Cambridge, MA Trolleybuses are particularly important in hilly cities, as the electric power is more effective than diesel in climbing steep hills and trolleybuses' rubber tires have better roadway adhesion than streetcars' steel wheels upon steel rails. |
 | | Like other electric vehicles, trolleybuses are often seen as more environmentally friendly than hydrocarbon-based vehicles (gasoline, diesel, alcohol, etc.), but the power is not "free", and instead has to be produced at centralised power plants, with its attendant transmission losses. |
| en.wikipedia.org /wiki/Electric_trolleybus (1012 words) |
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