Once railway station (Spanish: formally Estación Once de Setiembre (11 September Station), informally estación Once (Eleven Station)), IPA: [ˈonse]) is a large railway terminus in central Buenos Aires, Argentina. The station, inaugurated on December 20, 1882, is located in the barrio of Balvanera immediately north of Plaza Miserere, a large public square. The station is named for the September 11, 1852, rebellion of Buenos Aires against the Federal government of General Justo José de Urquiza. Coincidentally President Domingo Faustino Sarmiento also died on September 11 (1888), but contrary to popular belief in Argentina this is not the date commemorated by the station's name.
The original terminal, an unassuming clapboard structure, was ordered replaced by larger facilities following its 1890 purchase by the Buenos Aires Western Railway. Designed by architect John Doyer, the new, Renaissance Revival terminal was built in two stages, from 1895 to 1898, and from 1906 to 1907; refurbishment works completed in 1972 removed most of the terminal's ornate, cast-iron roof trusses (though these are still visible in the adjoining subway station).
Estación Once handles both long-distance and local passenger trains. The publicly owned railway company Ferrobaires operates trains over four principal rail lines which fan out west over the surrounding Buenos Aires Province. Destinations include Pehuajó, Bragado, and points between. Additionally, the commuter rail company Trenes de Buenos Aires operates a regular train service to the suburbs of Buenos Aires along the branches of its Sarmiento Line to destinations including Moreno, Luján, Lobos, and Mercedes. The station is accessible by numerous public bus services and by the A line of the Buenos Aires Metro via its "Plaza Miserere" station. Estación Once underwent extensive renovations prior to 2007, when the new H line of the metro reached the heavily transited terminal.