Trenes Argentinos Operaciones

Trenes Argentinos Operaciones is the trading name of Operadora Ferroviaria Sociedad del Estado, commonly abbreviated as SOFSE, an Argentine state-owned railway operating company. It is responsible for passenger train services across Argentina and functions within the Ferrocarriles Argentinos state railway structure. Its activities include Buenos Aires suburban commuter rail, intercity services linking the capital with provincial cities, and regional routes in several provinces. The company was created during a reorganization of Argentina's railway administration in 2008. Law 26.352 divided key railway responsibilities between two state entities: Administración de Infraestructuras Ferroviarias, responsible for railway infrastructure, and Operadora Ferroviaria, responsible for train operations. Decree 752/08 subsequently regulated the newly established operator. The creation of SOFSE followed a long period of railway privatization and concessioning that began in 1989, after which un-concessioned railway assets passed through several state property-administration bodies. SOFSE became operational in 2010 when it assumed services in Chaco Province that had previously been operated by Servicios Ferroviarios del Chaco. It expanded into regional operations in Salta and Buenos Aires Province in 2011. Following the creation of the Ministry of Transport in 2012, the company took responsibility for non-concessioned urban railway services in Greater Buenos Aires and began operating additional intercity routes, including services toward Córdoba and San Miguel de Tucumán and routes previously managed by the government of Entre Ríos Province. The operator's role increased substantially after the Argentine government withdrew or revoked several private railway concessions. In 2013, SOFSE assumed operation of Tren de la Costa after the state ended the concession held by Sociedad Comercial del Plata. It was also assigned the Mitre and Sarmiento lines after the concession held by Trenes de Buenos Aires was revoked, although Mitre was temporarily returned to private concession under Corredores Ferroviarios in 2014. In March 2015, the state cancelled the concessions for the Belgrano Sur, Roca, Mitre and San Martín lines and placed the services under SOFSE operation. This made the company a central operator of Buenos Aires commuter rail. The company also participated in the renewal and extension of long-distance passenger services. Chinese-built rolling stock entered service on routes including Buenos Aires–Mar del Plata, Buenos Aires–Rufino, and Buenos Aires–Córdoba. Service quality and journey times have been constrained by the condition of Argentina's railway infrastructure; the Buenos Aires–Córdoba journey, for example, was reported to take approximately 19.5 hours in 2015 for a route of about 700 kilometres. In 2023, the operator restored passenger railway service to Mendoza Province for the first time since the early 1990s, using Palmira as the terminus because the former Mendoza railway station had been incorporated into the local tramway network. SOFSE's network has also contracted in some areas. Services have been suspended or discontinued when the company or the government cited low demand, infrastructure deterioration, maintenance costs, flooding damage, bridge failures, accidents, or the need for track repairs. The company therefore combines a public-service mission with operational constraints typical of Argentina's fragmented and unevenly maintained railway system. Its principal role remains the operation of passenger services rather than ownership of all railway infrastructure or rolling stock.

Trenes Argentinos Operaciones, formally Operadora Ferroviaria Sociedad del Estado and commonly known as SOFSE, emerged from Argentina's attempt to reorganize passenger railway administration after decades of privatization and concessioning. Beginning in 1989, many railway services and assets were transferred to private operators, while assets that were not placed under concession passed through successive state bodies. Ferrocarriles Argentinos was dissolved, and from 1996 to 2000 the Ente Nacional de Administración de Bienes Ferroviarios administered remaining assets. In 2000, that body was merged into the Dirección Nacional de Bienes del Estado, after which the Organismo Nacional de Administración de Bienes managed railway property not directly assigned to state activities. Law 26.352, enacted in 2008, established a new institutional framework. It created Administración de Infraestructuras Ferroviarias to manage infrastructure and Operadora Ferroviaria to operate passenger railway services. Decree 752/08 provided the operating framework for the new company. Although SOFSE was legally created in 2008, it did not immediately operate a broad national network. Its first operational expansion occurred in 2010, when it took over passenger services in Chaco Province from Servicios Ferroviarios del Chaco. The operator expanded regionally in 2011 by adding services in Salta and Buenos Aires Province. A broader change followed in 2012, when the Ministry of Transport assigned SOFSE the non-concessioned urban services of Greater Buenos Aires. The company also began operating intercity routes, including services to Córdoba and San Miguel de Tucumán and routes that had previously been administered by the government of Entre Ríos Province. These developments shifted SOFSE from a limited state operator into a principal vehicle for direct public operation of passenger railways. In 2013, the state transferred operation of Tren de la Costa to SOFSE after revoking the concession held by Sociedad Comercial del Plata. That year, the government also assigned the Mitre and Sarmiento lines to SOFSE after cancelling Trenes de Buenos Aires' concessions. SOFSE's operation of Mitre was temporary: in February 2014, the line was placed under a new concession held by Corredores Ferroviarios, part of the Emepa Group. Rolling-stock renewal and route restoration were important elements of the company's subsequent development. In late 2014, new trains purchased from CNR Dalian in China entered service on the Buenos Aires–Mar del Plata route. In February 2015, passenger service between Buenos Aires and Rufino was restored after a 22-year interruption, also using new Chinese-built trains. In March 2015, SOFSE began operating Chinese CNR CKD8 trains on the Buenos Aires–Córdoba route. The service demonstrated the limitations imposed by infrastructure: the roughly 700-kilometre journey took around 19.5 hours, more than twice the travel time recorded for the route in 1938. A decisive institutional expansion occurred on 2 March 2015. The Argentine government rescinded the concessions for the Belgrano Sur, Roca, Mitre and San Martín commuter lines, previously operated by Argentren and Corredores Ferroviarios, and transferred them to SOFSE. The concession agreements allowed cancellation without compensation claims. Since then, these lines have formed the core of SOFSE's metropolitan passenger operation in Buenos Aires Province. The network has subsequently been adjusted in response to demand and infrastructure conditions. In January 2016, services between Santa Rosa and General Pico in La Pampa were stopped because of low demand and damage to bridges after flooding. In June of the same year, the Buenos Aires–Rosario service was extended to Rosario Norte, providing a terminus nearer to central Rosario. In March 2023, Trenes Argentinos announced the planned restoration of passenger service to Mendoza Province, interrupted since 1993. Because the former Mendoza station had become part of the Metrotranvía system, the service terminated at Palmira, approximately five kilometres from Mendoza. A trial run took place in March, and the route eventually reached Palmira in June after a delay. The long journey time, approximately 27 hours, attracted criticism in comparison with historical travel times. In subsequent years, some routes were suspended or closed. Reported reasons included low demand, increasing maintenance expenses, deteriorated infrastructure, bridge damage and the need for repairs following accidents or derailments. Among the affected services were Retiro–Justo Daract, Retiro–Palmira, Bragado–Pehuajó, General Guido–Pinamar and the Mercedes–Tomás Jofré tourist service. The latter became inactive after a truck destroyed a bridge in 2024 and the structure was not repaired. By late 2025, long-distance services toward Córdoba and San Miguel de Tucumán were reported as indefinitely suspended while track repairs continued after a September derailment. SOFSE therefore remains a major national passenger operator, but its effective network is shaped by the condition of Argentina's railway infrastructure, government policy and the financial and operational sustainability of individual routes.

1. 2023Passenger service restored toward Mendoza

   Passenger trains returned to Mendoza Province via Palmira after an interruption dating to 1993.

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2. 2015Major Buenos Aires commuter lines renationalized

   SOFSE took over the Belgrano Sur, Roca, Mitre and San Martín lines after the government cancelled their private concessions.

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3. 2013Tren de la Costa transferred to the state operator

   SOFSE assumed operation of Tren de la Costa after the state revoked its private concession.

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4. 2010First operating assignment in Chaco

   SOFSE began operating passenger services in Chaco Province after taking them over from Servicios Ferroviarios del Chaco.

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5. 2008Creation of Operadora Ferroviaria

   Law 26.352 created Operadora Ferroviaria Sociedad del Estado as the state entity responsible for passenger railway operations, alongside a separate infrastructure administrator.

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A state-owned national passenger railway operator focused on maintaining and expanding public rail services, especially Buenos Aires commuter routes and strategic intercity connections.

• Buenos Aires commuter railMetropolitan passenger rail2015

  SOFSE operates major suburban passenger lines in the Buenos Aires metropolitan area, including Mitre, San Martín, Roca and Belgrano Sur. These services connect the capital and surrounding Buenos Aires Province with dense residential, commercial and industrial areas. Their transfer to SOFSE in 2015 made metropolitan commuter rail the company's most important operating segment.

• Buenos Aires–Mar del PlataLong-distance passenger rail2014

  This intercity service links Buenos Aires with Mar del Plata, a major coastal city and tourist destination. New Chinese-built trains acquired through CNR Dalian entered service on the route in 2014. The corridor is one of the most visible long-distance passenger services associated with the Trenes Argentinos operating network.

• Buenos Aires–RosarioLong-distance passenger rail

  The Buenos Aires–Rosario service provides an intercity connection between Argentina's capital and Rosario. In 2016, its Rosario terminus was moved from Rosario Sur to Rosario Norte, placing the endpoint closer to central Rosario. The route forms part of the operator's principal northwestern Buenos Aires corridor.

• Buenos Aires–CórdobaLong-distance passenger rail2015

  SOFSE operates or has operated a long-distance service between Buenos Aires and Córdoba using CNR CKD8 trains acquired from China. The route has been affected by poor track conditions, producing journey times of approximately 19.5 hours for a distance of about 700 kilometres. It was reported as indefinitely suspended in late 2025 while track repairs continued after a derailment.

• Buenos Aires–Mendoza via PalmiraLong-distance passenger rail2023

  The Mendoza service was restored in 2023 after passenger operations to the province had been interrupted since 1993. Palmira was selected as the terminus because Mendoza's former railway station had become part of the Metrotranvía network. The service was criticized for its approximately 27-hour journey time and was later among the routes reported as suspended.

• Regional passenger servicesRegional passenger rail2010

  The operator has run regional services in provinces including Chaco, Salta, Buenos Aires, Entre Ríos and Santa Fe. These routes support public transport outside the Buenos Aires metropolitan area, but their continuity depends heavily on local demand, infrastructure condition, bridge availability and government operating decisions.

• 2025Indefinite suspension of selected long-distance servicesOther

  Track repairs were required after a derailment in September, affecting the viability of long-distance operations.

  What changed. Services toward Córdoba and San Miguel de Tucumán were reported as indefinitely suspended in December.

  Aftermath. The referenced material does not provide a reopening date.

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• 2024Suspension of services affected by infrastructure damageOther

  Several routes faced infrastructure failures, maintenance requirements, bridge damage, declining demand or rising operating costs.

  What changed. The operator suspended or closed services including Mercedes–Tomás Jofré, Retiro–Justo Daract, Retiro–Palmira and Bragado–Pehuajó.

  Aftermath. The Mercedes–Tomás Jofré tourist service remained inactive after a truck destroyed a bridge that was not subsequently repaired.

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• 2023Restoration of service to Mendoza ProvinceProduct launch

  Passenger service to Mendoza had been interrupted since 1993, while the former Mendoza railway station had been incorporated into the Metrotranvía network.

  What changed. Trenes Argentinos restored the route with Palmira as its terminus, approximately five kilometres from Mendoza.

  Aftermath. The service resumed in June after a delayed launch and was criticized for a journey time of about 27 hours.

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• 2016Suspension of La Pampa passenger servicesOther

  The Santa Rosa–General Pico route faced low passenger demand and bridge deterioration after flooding.

  What changed. The Ministry of Transport ceased operation of the service.

  Aftermath. Passenger rail service on the route was suspended; no restoration date is provided in the reference material.

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• 2015Takeover of four Buenos Aires commuter linesStrategy

  The Argentine government cancelled the concessions held by Argentren and Corredores Ferroviarios for the Belgrano Sur, Roca, Mitre and San Martín lines.

  What changed. SOFSE assumed direct operation of the four commuter systems on 2 March 2015.

  Aftermath. The transfer significantly expanded the company's metropolitan role and established it as a central public operator of Buenos Aires commuter rail.

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• 2025General Guido–Pinamar branch service suspended

  Passenger operation on the General Guido–Pinamar branch was suspended in April 2025.

  Other
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• 2025Long-distance services suspended for track repairs

  Services toward Córdoba and San Miguel de Tucumán were reported as indefinitely suspended in December 2025 while track repairs continued after an earlier derailment.

  Other
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• 2024Several passenger routes suspended or closed amid infrastructure problems

  The operator suspended or discontinued multiple services, including routes affected by maintenance costs, reduced demand, infrastructure failures and bridge damage. The Mercedes–Tomás Jofré tourist service remained inactive after a truck destroyed a bridge.

  Other
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• 2023Passenger trains return to Mendoza Province

  SOFSE restored passenger service toward Mendoza Province, with Palmira selected as the terminus. The journey was criticized for taking substantially longer than historical services.

  Product launch
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• 2016Service to La Pampa suspended

  The Ministry of Transport ended services on the Santa Rosa–General Pico route, citing low demand and bridge deterioration following flooding.

  Other
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• 2016Buenos Aires–Rosario service extended to Rosario Norte

  The Buenos Aires–Rosario service changed its Rosario terminus from Rosario Sur to Rosario Norte, closer to the city centre.

  Other
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• 2015Major Buenos Aires commuter concessions transferred to SOFSE

  The government rescinded the concessions for the Belgrano Sur, Roca, Mitre and San Martín lines and placed their operation under SOFSE.

  M&A
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• 2015Passenger service to Rufino restored

  Passenger trains returned between Buenos Aires and Rufino, Santa Fe, after a 22-year interruption, using newly acquired Chinese-built trains.

  Product launch
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• 2014Chinese-built trains introduced on Buenos Aires–Mar del Plata route

  New trains acquired from China's CNR Dalian entered service on the Buenos Aires–Mar del Plata corridor, while Ferrobaires continued operating the conventional service.

  Product launchProduct generation
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• 2013Tren de la Costa transferred to state operation

  SOFSE took over operation of Tren de la Costa after the Argentine government revoked the concession held by Sociedad Comercial del Plata.

  Other
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• 2013SOFSE assigned Mitre and Sarmiento services after concession revocation

  The government designated SOFSE to operate the Mitre and Sarmiento lines after revoking Trenes de Buenos Aires' concessions.

  Leadership change
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• 2012State operator expands into metropolitan and intercity services

  Following the creation of the Ministry of Transport, SOFSE assumed additional non-concessioned urban services in Greater Buenos Aires and began operating further intercity routes.

  Other
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• 2010SOFSE begins operating railway services in Chaco

  The newly established operator became active by taking over passenger services in Chaco Province from Servicios Ferroviarios del Chaco.

  Other
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• 2008SOFSE created as part of Argentina's railway reorganization

  Argentina established Operadora Ferroviaria Sociedad del Estado under the railway reorganization framework created by Law 26.352 and regulated by Decree 752/08.

  Other
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1. Trenes Argentinos Operaciones