The Buenos Aires Underground (Spanish: Subterráneo de Buenos Aires), locally known as Subte, is a mass transit metro system that serves the metropolitan area of Buenos Aires, Argentina. The first section of this network opened in 1913, making it the first underground railway in Latin America, the Southern Hemisphere and the Spanish-speaking world. The network expanded rapidly during the early decades of the 20th century; by 1944 its main routes were completed. In the late 1990s expansion resumed, and four new lines were planned for the network, with the addition of its newest line occurring in 2007. Two modernisation plans have been presented: City of Buenos Aires law 670, proposing the creation of 3 new lines, F, G and I; and the PETERS plan, wherein 2 lines are created and the I line is postponed for future expansion, plus several other route amendments. As of 2015, Buenos Aires is the only Argentine city with a metro system. The underground network's six lines: A, B, C, D, E, and H, comprise 53.9 kilometers (33.5 mi) of route, serving 85 stations. The network is complemented by the 7.4 km long Premetro line, and the 26 km long Urquiza suburban line, with 17 more stations in total. Over a million passengers use the network, which also provides connections with the city's extensive commuter rail and bus rapid transport networks.
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