A tram (also known. as a tramcar, streetcar, trolley car) is a passenger rail vehicle which runs on tracks along public urban streets and also sometimes on separate rights of way. It may also run between cities and/or towns. Trams very occasionally also carry freight. Trams are usually lighter and shorter than conventional trains and rapid transit trains.
Most trams today use electrical power, usually fed by a pantograph; in some cases by a sliding shoe on a third rail or trolley pole. If necessary, they may have several power systems. Certain types of cable car are also known as trams. Another power source is diesel; a few trams use electricity in the streets and diesel in more rural environments. Also steam and petrol (gasoline) have been used. Horse and mule driven trams do still occur.
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