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.

Juan Domingo Perón was an Argentine lieutenant general and politician who served as the 35th President of Argentina from 1946 to his overthrow in 1955, and again as the 45th President from October 1973 to his death in July 1974. He had previously served in several government positions, including Minister of Labour and Vice President under presidents Pedro Pablo Ramírez and Edelmiro Farrell.