Ferrocarriles Argentinos was a state-owned company that managed the entire Argentine railway system for nearly 45 years. It was formed in 1948 when all the private railway companies were nationalised during Juan Perón's first presidential term, and transformed into the Empresa de Ferrocarriles del Estado Argentino.

The railway natinalisation in Argentina occurred on March 1, 1948, during President Juan Perón's first term of office, when the seven British- and three French-owned railway companies then operating in Argentina, were purchased by the state. These companies, together with those that were already state-owned, where grouped, according to their track gauge and locality, into a total of six state-owned companies which later became divisions of the state-owned holding company Ferrocarriles Argentinos.