The General San Martín Railway (FCGSM), named after the former Argentine general José de San Martín, was one of the six state-owned Argentine railway companies formed after President Juan Perón's nationalisation of the railway network in 1948. The six companies were managed by Ferrocarriles Argentinos which was later broken up during the process of railway privatisation beginning in 1991 during Carlos Menem's presidency.

Railway privatisation in Argentina was a process which began in 1989 under the presidency of Carlos Menem, following a series of neoliberal economic reforms. This primarily consisted of breaking up the state-owned railway company Ferrocarriles Argentinos (FA) and allowing the former lines to be operated by private companies instead of the state.