A trolley (also known as a tramcar, streetcar, or trolley car) is a rail vehicle which runs on tracks along public urban streets, and also sometimes on separate rights of way. Trams powered by electricity, which were the most common type historically, were once called electric street railways. Trams also included horsecar railways which were widely used in urban areas before electrification.
Trams may also run between cities and/or towns (for example, interurbans, tram-train), and/or partially grade separated even in the cities (light rail). Trams very occasionally also carry freight.
Tram vehicles are usually lighter and shorter than conventional trains and rapid transit trains. However, the differences between these modes of public transportation are often indistinct. 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.
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