The Belgrade tram system is a large network with 12 lines totalling 127.3 route km.^{[citation needed]} It is operated with around 200 trams, including ČKD Tatra KT4, CAF Urbos, and DUEWAG Be 4/6 vehicles. The first tram line was introduced in October 1892. In the late 2000s, complete reconstruction of the system started.

There are twelve lines in operation during the day, and two during night.

On the 14th of October 1892, the first tram line in Belgrade was opened. It went from Kalemegdan to Slavija. The first electric line was introduced in 1894. Then for about 10 years, from the end of 1894, there were no works on modernization and widening of the tram system. It was not until 1903, when the operations related to the construction and exploitation of tram transport and electric lighting were passed, that the electrification of tram lines sped up.

During 1904, electric trams replaced horse-drawn trams on the Kalemegdan – Slavija and Kafana Žagubica (Inn) – Električna centrala routes and in 1905 the last ones were replaced at Terazije - Novo groblje route. Apart from performing the function of public transport, “horse trams” were also a focus of great interest in Belgrade at the time and their striking image remained with their contemporaries for a long time.

Belgrade ( /ˈbɛlɡreɪd/; Serbian: Београд; [beǒɡrad] ( listen); names in other languages) is the capital and largest city of Serbia. The city is located at the confluence of the Sava and Danube rivers, where the Pannonian Plain meets the Balkans. Its name in English translates to White city. The city proper has a population of over 1.1 million, while its metropolitan area has over 1.6 million people, making it one of the largest cities in Southeast Europe.

One of the largest prehistoric cultures of Europe, the Vinča culture, evolved around the area Belgrade in the 6th millennium BC. In antiquity, Thraco-Dacians inhabited the region, and after 279 BC Celts conquered the city, naming it Singidūn. It was conquered by the Romans during the reign of Augustus, and awarded city rights in the mid 2nd century. It was settled by the Slavs in the 520s, and changed hands several times before it became the capital of King Stephen Dragutin (1282–1316). In 1521 Belgrade was conquered by the Ottoman Empire and became the seat of a the Sanjak of Smederevo. It frequently passed from Ottoman to Habsburg rule, which saw the destruction of most of the city during the Austro-Ottoman wars. Belgrade was again named the capital of Serbia in 1841. The north of Belgrade remained a Habsburg outpost until 1918, when it was merged into the capital city. As a strategic location, the city was battled over in 115 wars and razed to the ground 44 times. Belgrade was the capital of Yugoslavia (in various forms of governments) from its creation in 1918, to its final dissolution in 2006.

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 (interurbans, tram-train), and/or partially grade separated even in the cities (light rail). Trams very occasionally also carry freight.

Trams are usually lighter and shorter than conventional trains and rapid transit trains. However, the differences between these modes of public transportation are often unclear. 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.

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.