Tren de las Sierras (technically known as the "A-1" branch of the General Belgrano Railway) is a 150.8 km (93.7 mi) regional rail line in Córdoba Province of Argentina.

By the 1960s the line had its golden age when it carried a big number of passengers of Valle de Punilla, as well as tourists coming from the cities of Córdoba, Rosario and Buenos Aires at attractive prices.

[7] Three years later the Government of Córdoba revoked the contract of concession (by Provincial Decree n° 1274) blaming the concessionary for the bad conditions of the service and poor maintenance.

Private consortium Ferrocentral (formed by railway companies Ferrovías and Nuevo Central Argentino) was granted concession to operate the service.

[2][14] In March 2015, this section of the railway was re-opened by the Minister of the Interior and Transport, Florencio Randazzo[15] In September 2013 State-owned company Trenes Argentinos took over the Tren de las Sierras, operating it up to present days.