structural:reformatting
Tram network

Zagreb has an extensive tram network with 15 day and 4 night lines covering much of the inner- and middle-suburbs of the city. The first tram line was opened on 5 September 1891 and trams have been serving as a vital component of Zagreb mass transit ever since. Trams usually travel at speeds of 30–50 km/h (19–31 mph), but slow considerably during rush hour. On narrower streets the tracks are either shared with car traffic or separated by a painted yellow line, which can still be used by taxis, buses and emergency vehicles, whereas on larger avenues the tracks are situated inside green belts.

An ambitious program, which entailed replacing old trams with the new and modern ones built mostly in Zagreb by companies Končar elektroindustrija and, to a lesser extent, by TŽV Gredelj, has recently been finished. The new " TMK 2200 ", trams by the end of 2012 made around 95% of the fleet.