line and route in the world is the interurban Belgian Coast Tram (Kusttram), which runs almost the entire length of the Belgian coast. Another fairly long interurban line is the Valley Metro Rail in agglomeration of Phoenix, Arizona, with its . World's longest urban (intracity) tram line is 33 km counter-ring routes 5/5a in Kazan (Tatarstan, Russia). Since 1985, 120 light rail systems have opened; Since 2000, 78 systems have opened while 13 have closed. The countries that have opened the most systems since 2000 are the USA (23), France (20), Spain (16), and Turkey (8); of track is in operation, with in construction and a further planned; The longest systems are in Melbourne (), Saint Petersburg (), Katowice (Upper Silesian Industrial Region) (), Cologne (), Berlin (), Milan (), Budapest (), and Vienna (). These lines have 32,345 stops at an average spacing of 484 metres; They carry 13.5 billion passengers a year, 3% of all public transport passengers. The highest-volume systems are Budapest (396 million passengers a year), Prague (372 m), Bucharest (322 m), Saint Petersburg (312 m), and Vienna (305 m); The most intensely used networks (passengers per km of, per year) are: Istanbul, Hong Kong, Tokyo and Sarajevo. Just over 36,000 trams and light rail vehicles are in operation. The largest fleets are in Moscow (919), Saint Petersburg (833), Prague (830), Budapest (612) and Warsaw (526); Between 1997 and 2014, 400–450 vehicles have been built per year. As of October 2015, Hong Kong has the world's only exclusively double-decker tramway system. The most intensively used junction in any tram network is the Lazarská x Spálená junction in Prague with appx. 150 vehicles passing through per hour. World's longest 9-sectioned -meter articulated tram vehicle CAF Urbos 3/9 started operation in Budapest in 2016. Škoda ForCity vehicles family allows expansion of length up to with 539 passengers. Historical Historically, the Paris Tram System was, at its peak, the world's largest system, with of track in 1925 (according to other sources, ca. of route length in 1930). However it was completely closed in 1938. The next largest system appears to have been , in Buenos Aires before 19 February 1963. The third largest was Chicago, with over of track, but it was all converted to trolleybus and bus services by 21 June 1958. Before its decline, the BVG in Berlin operated a very large network with of route. Before