![]() ![]() If necessary, they may have dual power systems-electricity in city streets and diesel in more rural environments. In some cases, a contact shoe on a third rail is used. ![]() Today, most trams use electrical power, usually fed by a pantograph sliding on an overhead line older systems may use a trolley pole or a bow collector. Tram vehicles are usually lighter and shorter than main line and rapid transit trains. In the United States, the term tram has sometimes been used for rubber-tired trackless trains, which are unrelated to other kinds of trams. To avoid further confusion with trolley buses, the American Public Transportation Association (APTA) refers to them as " trolley-replica buses". In parts of the United States, internally powered buses made to resemble a streetcar are often referred to as "trolleys". Streetcar or tramway are preferred in Canada. The first two terms are often used interchangeably in the United States, with trolley being the preferred term in the eastern US and streetcar in the western US. The vehicles are called streetcars or trolleys (not to be confused with trolleybus) in North America and trams or tramcars elsewhere. Many recently built tramways use the contemporary term light rail. The tramlines or networks operated as public transport are called tramways or simply trams/streetcars. A tram (called a streetcar or trolley in North America) is a rail vehicle that travels on tramway tracks on public urban streets some include segments on segregated right-of-way. ![]()
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