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Tram (also tram; in North America tram, trolleybus, trolleybus or train, in Australia, called tram or light rail) is a railway vehicle running on the tram track of public city street, sometimes also located on the line or network operated by tram, called tram road, and the tram road (the most common type) driven by electric power has been called Electric Street Railways (mainly in the United States) are widely used in urban areas before they were widely used. In the United States, the term "tram" is sometimes used for rubber tyred trackless trains, independent of the other vehicles described herein.

Trams are usually lighter and shorter than regular trains and express trains. Nowadays, most trams use electric energy, which is usually supplied by overhead pantographs sliding on overhead lines. In some cases, this can be achieved by a slide shoe on a third rail, a boom, or a bow and arrow collector that slides on overhead lines. If necessary, they may have dual power systems - electricity for urban streets, and diesel for a more rural environment. Today, trams are often included in the broader term "light rail," which also includes a system of grade separation.

Tram lines can also run between cities (for example, between cities, between tram trains) or even between countries (Basel, Strasbourg), or even between cities (light rail). Occasionally, trams carry goods. Some trams (such as trams) may also run on ordinary railway tracks, trams may be upgraded to light rail or bus rapid transit lines, two urban trams may be connected to cities, etc. For all these reasons, the differences between the various modes of railway transportation are usually not obvious.

One of the advantages compared with the early mode of transportation is that the rolling resistance of the steel wheel on the rail is low, so that the animals can bear more load under the given effort. The problem includes the fact that any given animal can only work so long in a day, must be fed, groomed, fed and cared for day after day, and produce a lot of feces, which tram is accused of. handle. At the end of the 19th century and the beginning of the 20th century, trams largely replaced animal power. In the middle of the 20th century, the improvement of bus and other road transportation forms led to the decrease of tram number. In recent years, trams are recovering.