General Manuel Belgrano Railway projects to run passenger services between La Quiaca and San Salvador de Jujuy, both cities in Jujuy Province. The main lines departed from Retiro station in Buenos Aires to the north through the provinces of Buenos Aires, Santa Fe, Córdoba, Santiago del Estero, Tucumán, Chaco, Formosa, Salta, Jujuy, San Luis, Mendoza, San Juan, La Rioja and Catamarca. In 1876, Ferrocarril Central Norte started services from Córdoba to Tucumán. It was the first metre gauge in Argentina, mainly due to economic reasons. It had been built by the Argentine State to expand Central Argentine Railway network (Rosario-Córdoba), a British-owned company by
Climatic regions of Argentina temperate and arid with large thermal amplitudes, long summers, and a long frost free period which varies by altitude. In both the Quebrada de Humahuaca and Calchaquí valleys, winters are cold with frosts that can occur between March and September. In the valleys in the south in La Rioja and Catamarca Provinces, along with the southwest parts of Santiago del Estero Province, temperatures during the summer are very high averaging in January, while winters are mild averaging . Temperatures can exceed during the summer, particularly in the central valley of Catamarca (Valle Central de Catamarca) and the valley of La