The Sofia trolleybus system () forms part of the public transport network of Sofia, the capital city of Bulgaria. In operation since 8 February 1941, the system presently comprises ten routes with 257 km network build, of which 193 km are currently in use. As of 2020 the average speed of the trolleybus system in Sofia is 15.7 km/h. History Trolleybus transport was the last form of surface public transport to develop in Sofia, after buses and trams. The first Sofia trolleybus line opened on 8 February 1941. It was over long, and connected the city with the Gorna Banya quarter. The line was covered by 2 MAN trolleybuses, which were stored on the last stops during the night, due to the lack of depot. In the 1950s and 1960s, massive development of the trolleybus transport in Sofia began. At that time, the construction of new trolleybus routes proceeded especially rapidly, and two depots ("Stochna Gara" and "Nadezhda") were opened, with a total capacity of 160 trolleybuses. In 1951, the first Bulgarian made trolleybuses entered service. In 1987, a new depot, "Iskar", was opened with a capacity of 130 trolleybuses. Levski depot was opened in 1994 with capacity of 60 trolleybuses. As of 2021 three depots are in operation: Nadezhda, Iskar and Levski. The latter also serves as a storage and overhaul facility. Lines As of November 2021, the following trolleybus lines in Sofia are in service: Trolleybus fleet Current fleet As of December 2022, the Sofia trolleybus fleet consisted of 141 trolleybuses, of which around 120 are serviceable. The following models are currently part of the fleet: The heritage fleet consists of the following vehicles: Past fleet Depots Nadezhda - opened in 1962, located on podpolkovnik Kalitin street, operates lines 5, 6, 7 and 9; houses trolleybuses with fleet numbers starting with 2 Iskar - opened in 1987, located on Amsterdam street, operates lines 2, 3, 4, 5, 8 and 11; houses trolleybuses with fleet numbers starting with 1 Levski - opened in 1994, located on Bessarabia street, serves as maintenance and overhaul facility and for storage and dismantling of decommissioned vehicles. Since November 2021 also operates line 1. See also Sofia Metro Sofia Public Transport Sofia Tramway List of trolleybus systems References External links Official website of Sofia Public Electrical Transport Company JSC (in English) Images of the Sofia trolleybus system, at railfaneurope.net Transport in Sofia Sofia Sofia