Tram

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A tram (British English), tramcar, streetcar or trolley car (American English) is a railborne vehicle which at least in parts of its route runs on tracks in streets. It may also run between cities and/or towns (interurbans, Tram-train), and/or partially grade separated even in the cities (light rail or light rapid transit). Trams are usually lighter and shorter than conventional trains and rapid transit trains. However, the differences between these modes of public transportation are imprecise. Some trams (for instance Tram-Trains) may also run on ordinary railway tracks, a tramway may be upgraded to a light rail or a rapid transit line, two urban tramways may be united to an interurban, etc. Trams are designed for the transport of passengers and (very occasionally) freight. Most trams today use electrical power, usually fed by a pantograph; in some cases by 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.