The Buenos Aires Metro (Spanish: Subterráneo de Buenos Aires), locally known as Subte (, from subterráneo – 'underground' or 'subterranean') is a mass-transit system that serves the city of Buenos Aires, Argentina. The first station of this network opened in 1913. It is one of the busiest metro systems in the world.
The network expanded rapidly during the early decades of the 20th century, but the pace of expansion fell sharply after the Second World War. In the late 1990s expansion resumed, with the planning of four new lines. However, the rate of expansion is largely exceeded by the transportation needs of the city and once again the network has become overcrowded.
At present, Buenos Aires is the only Argentine city with a metro system, but there is a project to build an underground system in the city of Córdoba (Córdoba Metro).
Read more about Buenos Aires Metro: History, Current Network, Stations and Connections, Cultural Heritage, In Popular Culture, PreMetro Light Rail, Urquiza Line