The Central Argentine Railway, referred to as CA below, (in Spanish: Ferrocarril Central Argentino) was one of the Big Four broad gauge, 5 ft 6 in (1,676 mm) British companies that built and operated railway networks in Argentina. The company had been established in the 19th century, to serve the provinces of Santa Fe and Córdoba, in the east-central region of the country. It would later extend its operations to Buenos Aires, Tucumán, and Santiago del Estero. The railroad had a complicated relationship with its employees in the 1910s, and then it had a complicated relationship with the government of Argentina in the 1920s.