General Bartolomé Mitre Railway

A CNR CKD8 Ferrocarriles Argentinos train bound for Rosario.

Rosario Central station, closed in 1977.

Rosario Norte, originally built by the Buenos Aires and Rosario Railway.

Córdoba station.

Retiro, terminus of urban and interurban services of the line.

Level crossing in Olivos (1961).

A train with Metropolitan Vickers wagons acquired in the 1910s. They were in use until the 1990s.

Tucumán station.

After the World War II finished, British and French-owned railway companies in Argentina began proceedings with the purpose of selling their railways due to financial problems to operate those services. Finally on March 1, 1948, all the foreign railway companies in Argentina were nationalised under the Juan Perón's administration, creating the State-owned company "Empresa de Ferrocarriles del Estado Argentino (EFEA)", then renamed to Ferrocarriles Argentinos, taking over all the railway lines of Argentina, including passenger and freight services.

The following broad gauge railway companies were added to Ferrocarril Mitre network

Notes:

• ⁽¹⁾ The Central Argentine had previously acquired the BA Northern (1888), BA & Rosario (1902) and Santa Fe Western (1900) railway companies.
• ⁽²⁾ The north section of the R&PBR (from Rosario to Ingeniero Beaugey) only.

Soon after the reorganization of the nationalized railway system, the Ferrocarril Mitre closed the Ferrocarril Rosario y Puerto Belgrano's Rosario station, moving the passenger services terminus to Rosario Central. A sector of the old station would be later used to build the Ciudad Universitaria of Rosario. The station building was also used as a school of music and the Faculty of Engineering of Rosario established there.

The Rosario Este station was also closed soon after. On the land where it stood, a public park (named "Parque Urquiza") was planted. The Fisherton station was renamed "Antártida Argentina".

In 1977 the most of urban passenger services in the city were cancelled. The Rosario Central station was closed, becoming Rosario Norte the new terminus of the line. Many stations also ceased their activities, such as Antártida Argentina, Barrio Vila, Sarratea, Ludueña and Alberdi. One year later the remaining passenger services were definitely closed.

On November–December 1989 the Ferrocarril Mitre reactivated the Rosario Central station when the Municipality of Rosario launched a passenger service (named "Ferrobús") using the chassis of a bus specially remodeled to run as a train coach. Departing from Rosario Central, the ferrobús crossed the Rosario downtown until the National Flag Memorial when it finished the journey. The ferrobús run four times a day, being soon demanded by a high number of users. Despite the advantages of this service and the satisfactory results, the ferrobús was cancelled by the end of that year and has never returned since.

With the railway nationalization, the Retiro train and underground rail stations were renamed "Presidente Perón" honoring former president of Argentina. This lasted until 1955 when the de facto government established after the Revolución Libertadora restored the original names to both terminus.

The Metropolitan Vickers coaches acquired to the British company run for the first time in 1916, when the Retiro-Delta branch was electrified. This wagons were introduced to replace the old steam locomotives still running in the line. During the 1950s, the possibility to close the branch to Delta del Tigre began to be considered by the national government. It raised due to the Retiro-Tigre branch run laid parallel to Olivos station, carrying much more passengers than the first one. Nevertheless, the project was not carried out during that decade.

Finally, on November 8, 1961, the Government of Argentina (led by Arturo Frondizi) decided to close the branch from Bartlomé Mitre to Delta. Only some freight trains would sporadically run through those tracks until they disappeared definitely. Since the branch felt into disuse, the railway buildings and lands behind the tracks were illegally usurped by homeless families, while on the other hand, groups of neighbors claimed for the re-establishing of the services.

During the government of Frondizi, the State acquired new electric coaches by Japanese company Toshiba for the rest of Mitre urban lines. Due to the Toshiba wagons had another structure than Metropolitan Vickers', new elevated platforms had to be added to each station to allow passengers to enter the trains.

During this period, the services to Zárate and Campana were run with diesel locomotives by US company ALCO. By 1970 the Municipality of Buenos Aires built a tunnel on Avenida del Libertador that passed under the Retiro-Tigre branch. Between 1985 and 1985 Ferrocarriles Argentinos (that run all the urban services by then) signed agreements with different Municipalities of Greater Buenos Aires to build more tunnels to replace the level crossings existing in those districts.

The Buenos Aires-Tucumán Express was a service that made its first trip in the 1969 after two years working in the maintenance of the infraestructure of the branch. The service joined Buenos Aires and Tucumán taking 15 hours to make 1,156 km between both cities. The service on board included a restaurant, ambient music, air conditioning among other comforts.

The Express was considered one of the most luxurious trains in the world at the time, becoming one of the most emblematic services by Ferrocarriles Argentinos.

Some of the works made that contributed to the success of the Express included 357 km of new rail tracks in Santiago del Estero Province and José León Suárez in Greater Buenos Aires, reparating and maintenance of rolling stock in Rosario workshops, remodelation of Hitachi coaches in Junín workshops, brand new Fiat-Concord coaches acquired, remodelling of stations, level crossings, bridges, signalling, construction of new platforms, installation of a luggage belts in Retiro, electronic signs in the main stations of the line (Retiro, Tucumán, Rosario, La Banda) indicating departures and arrivals of the trains and the opening of new ticket booths.

The material used included 3,700 tons of rail tracks produced by local metallurgic company Somisa, 50,000 tons of ballast, 700 tons of metallic accessories and 8,000 protectors for the third rail.[2]

Train of private company Tren de la Costa.

The new Tigre station building, opened in 1995.

On September 1990 the project to re-open the Mitre-Delta branch was reactivated. Tren de la Costa S.A., a company of local Sociedad Comercial del Plata, owned by Santiago Soldati, won the tender and began the works to reactivate the branch. The company remodeled the 8 stations of the branch and built 3 new stations, most of them with the concept of shopping mall centers, being San Isidro the most representative of this tendence.

A new terminus, named "Maipú" was built just in front of former terminus Bartolomé Mitre. Both stations were connected through a pedestrian bridge over Maipú Avenue. Unlike the Retiro-B. Mitre branch, the new Maipú-Delta service was a light rail system, using two-car train sets acquired to Spanish company Construcciones y Auxiliar de Ferrocarriles (CAF).

The service between Maipú-Delta was opened in April 1995.

The project delayed more than a year until on December 7, 1994, the train made its first trip from Delta-Libertador. Then President of Argentina Carlos Menem attended the celebration. The official opening was on April 20, 1995 when the first train departed from new station Maipú to Delta, launching the passenger service 5 days later.

During the first years of existence, the branch carried an average of 100,000 passenger (on weekends) due to it had been conceived as a tourist train, with Maipú, Libertador and San Isidro as its main commercial centres. Beside Delta terminus, a new amusement park, "Parque de la Costa" was built, self-proclaiming "the largest in South America". Parque de la Costa -opened in April 1997- invested US$100 million to be constructed. Two years later, the "Trillenium Casino" opened beside the park and Delta station. SCP and Grupo Bolt invested A$ 70 million. The new gamble center had 1,800 slots machines, 76 game table and 2 electronic roulettes.

Successive economic crashes such as Tequila crisis of Mexico (1994) and Asia financial crisis (1997) caused a decrease of the number of passenger carried by the company, affecting not only the train services but the amusement park as well. The SCP asked the national government a grant to continue operating the trains but the request was denied due to the concession contract did not include the possibility of granting subsidies because Tren de la Costa was categorized as a tourism train unlike the rest of the lines that were a public passenger transport.

After a progressive decrease of the number of passengers carried and the closure of most of shops in the stations,[3] The Government of Argentina revoked the concession to SCP, taking over the Tren de la Costa through its subsidiary SOFSE.[4][5]