The tram network of Budapest is part of the mass transit system of Budapest, the capital city of Hungary. The tram lines serve as the second most important backbone of the transit system (after the bus network), carrying almost 100 million more passengers annually than the Budapest Metro. In operation since 1866, the Budapest tram network is one of world's largest tram networks, operating on of total route. , it was composed of 38 lines (26 main lines, and 11 supplemental lines denoted by an ’A’ , ’B’ or ’G’ after the route number), and the Budapest Cog-wheel Railway. The system is operated by Budapesti Közlekedési Zrt. (’Budapest Transit LLC.’) under the supervision of the municipal Budapesti Közlekedési Központ (’Budapest Transit Center’). Since 2016 Budapest tram system use the world's longest 9-sectioned articulated tram vehicle CAF Urbos 3/9. History The early days The first horse-tram line in Budapest was inaugurated on 30 July 1866 between Újpest-Városkapu and Kálvin tér, through Váci út. Over a year before, on 22 May 1865, the Count Sándor Károlyi founded the PKVT (Pesti Közúti Vaspálya Társaság ()). Horse tramlines in Buda proper soon followed, built by the competing Buda Public Road Rail Tracks Company (BKVT). By 1885, Budapest had as many as 15 horsecar lines but since it was obvious that the technology was obsolete. A steam-driven suburban railway line from Közvágóhíd (Slaughterhouse) to Soroksár, run by HÉV, was separately introduced in 1887; two more lines soon followed. Around this same time, Mór Balázs suggested that a new, electric tram system should be introduced to Budapest. It was Gábor Baross, then secretary of state at the Ministry of Community Service and Transportation who authorised the construction of the first test tram line between Nyugati railway station and Király utca. Balázs teamed up with Siemens & Halske and Lindheim és Társa and formed a new corporation: BVV (Budapesti Városi Vasút ()). The construction works (carried out by Siemens & Halske) started on October 1, 1887 and the line was opened on November 28, 1887. The track gauge of this first line was and electricity was supplied to the cars from below to avoid cables hanging across the street. The second step in the expansion of the system were two lines: on July 20, 1889 the second line, which spanned from Egyetem tér to Fiumei út via Kálvin tér, was opened. It was designed so that in