Operadora Ferroviaria Sociedad del Estado (SOFSE), trading as Trenes Argentinos Operaciones, is an Argentine state-owned company created in 2008 to operate passenger services in Argentina.

In June 2013, SOFSE took over the Tren de la Costa when the Government decided the company would be managed by the Argentine State after revoking the contract with Sociedad Comercial del Plata.

[6] In September 2013, the Government of Argentina designed SOFSE to operate the Mitre and Sarmiento lines, after their contracts of concession were revoked to Trenes de Buenos Aires.

[12][13][14] In December 2014, brand new trains acquired by the Government of Argentina from Chinese company CNR Dalian, started to run luxury services from Constitución to Mar del Plata.

The Government took the decision based on the low demand of the Santa Rosa–General Pico line and the poor conditions of some bridges that had deteriorated after the flooding in August 2015.

[30][29] After a delay that took more than two months,[31][32] the service (that had terminus in Justo Daract, San Luis Province) was finally reestablished to reach Palmira in June 2023.

The list includes urban railways such as Mitre, San Martín, Roca and Belgrano Sur lines previously managed by private companies.