National manufacturers impulse
At the moment of being nationalised, most part of Argentine railways' locomotives still were steam-powered and long-distance trips were in wooden coaches. It was not until the 1950s when the Government acquired brand new diesel locomotives produced in the United States and Belgium, more specifically Cockerill-Ougree, Baldwin-Lima-Hamilton. Also, Budd Company coaches that were previously used on the canceled C&O Chessie would be used in El Marplatense, an express service from Constitución to Mar del Plata with multiple luxury services.
Despite the success of El Marplatense, FA did not acquire new material from Budd Co., Dutch company Werkspoor being the new locomotives, coaches and railcars suppliers. The Werskpoor rolling stock was used for services to Mendoza, Córdoba and Tucumán. Other companies like Ganz and Drewry being the new diesel railcars suppliers
During those years the first diesel locomotive manufactured in Argentina and produced at Liniers workshops by national company Fábrica Argentina de Locomotoras ("FAdeL") was launched in October 1951 by President Perón and its designer and builder, engineer Pedro Sacaggio. That locomotive (officially, "CM1", and named Justicialista) started to run in the summer of 1952-53 serving in El Marplatense and completing the 400-km length in only 4 hours. The CM1 was also used for services to Bariloche and Mendoza at an average speed of 90 km/h.
The second model by FADEL was the CM2 La Argentina, powered with diesel engines by Italian manufacturers FIAT Ferroviaria and Cantieri Riuniti Dell Adriático. Nevertheless, the project to produce 600 locomotives was aborted by the Revolución Libertadora that took the Government in 1955. FADEL was subsequently closed and the plan of construction dismissed.
After the closure of FADEL, Ferrocarriles Argentinos committed a company the manufacturing of 280 locomotives that would be powered with the 280 engines that had been acquired to FIAT, originally intended to be used in the FADEL machines to be built. The new manufacturer was a local Italian-Argentine consortium named "Gruppo Aziende Italiane e Argentine" (mostly known for its acronym "GAIA"). The first 80 units and their engines were totally manufactured in Italy and the remaining 200 were built in Argentina between 1964 and 1970, using mostly national components. Despite the efforts to make a reliable locomotive for the Argentine railways, the GAIA machines did not satisfy the expectations and many units would be removed from circulations, remaining only a few locomotives serving at FA.
In 1958 Sociedad Material Ferroviario ("Materfer") was established by Fiat Ferroviaria, through Fiat Concord, a consortium formed by many FIAT subsidiaries operating in Argentina. The company built a factory to manufacture rolling stock in the country to provide goods for FA.[9]
That same year the Ministry of Transport of Argentina signed an agreement with Fiat Ferroviaria to acquire 210 brand-new railcars. Those machines were formed by 2 units powered by a FIAT diesel engine at 660 HP. The railcars could reach speeds of 115 km/h. Their low weight made them suitable to run on any railway line. The vehicles also had two driver cabins, one on each end of the car, which reduced the time of manoeuvres at termini stations, particularly in urban services.
Railcars were built in the FIAT factories of Turin, Decauville and Córdoba. Although the first railcars were manufactured in Italy and France, most of them were made in Argentina, in a factory specially designed for that assignment located in Ferreyra, Córdoba and named "Materfer". In 1962, the 7131, a railcar manufactured by FIAT Concord, made its debut in the Villa Ballester-Zárate and Victoria-Capilla del Señor sections of General Mitre Railway, then managed by Ferrocarriles Argentinos. Those light cars replaced Ganz Works railcars that had been run on those lines since 1938.[10]
Materfer also produced coaches that looked like Werkspoor's that were used for long-distance services to Bariloche (Los Arrayanes), Tucumán (Independencia), Posadas (Cataratas), Mendoza (El Libertador) with international connections with Chile and the Expreso del Sur.
Imported rolling stock
In 1951, the company acquired a total of 46 coaches from US manufacturer Budd Company. The rolling stock, originally built for standard gauge railways, had to be adapted to indian gauge used in Roca Railway. After a probationary period, trains began to run express services to Mar del Plata with a journey time of about 5 hours. Unlike old wooden coaches used until then, the American wagons were made of steel and came with comforts such as air conditioning and double glazing to insulate the passengers from noise, arm chairs, bars and restaurant carriage.[11]
In 1955, 30 Werkspoor locomotives made in The Netherlands were acquired for the Belgrano Norte line. As a result, FA sent the old Ganz Works vehicles to Córdoba to serve regional railways. Four years later, a fleet of 21 English Electric locomotives arrived to replace Whitcomb and Werkspoor machines. In 1964, 27 coaches built by Aerfer, a subsidiary of FIAT Ferroviaria, were added to the line. Four years later, the fleet size was increased with the addition of 20 coaches built by local company Materfer