Metrovías operates a transit metro system that first opened in which year ?
Metrovías: Metrovías S.A. is an Argentine privately owned company that operates the Buenos Aires Underground and the Metropolitan services of Urquiza Line. Buenos Aires Underground:  The first section of this network (Plaza de Mayo-Plaza Miserere) opened in 1913, making it the 13th subway in the world, and first underground railway in Latin America, the Southern Hemisphere and the Spanish-speaking world, with the Madrid Metro opening five years later, in 1919.
1913