ARGENTINA, 1973
Much of the extensive railway system was financed by capital raised in London and UK loco builders provided many engines over the years. And not only steam, as Argentina was a fairly early adopter of diesel traction, see https://www.derbysulzers.com/argentinadmu1935.html for a detailed look at some early internal combustion locos.
Below are further details of the Pacifics as published in a Vulcan Foundry brochure (online at http://enuii.com/vulcan_foundry/ ). It seems the post-war order was reduced from 50 to 30 with twenty-one 1000hp English Electric/Vulcan Foundry metre gauge diesels being delivered instead. These were also very successful.
5 ft. 6 in. Gauge 1950 and 1953 4-6-2 (PS.11)
Cylinders................. (3) 19½ in. Diam. x 26 in. Stroke
Diameter Coupled Wheels........................ 6 ft. 2½ in.
Working Pressure.................................. 225 lb.
Tractive Effort at 85% Pressure................. 38,068lb.
Maximum Axleload................................. 18 tons
Weight :
Engine in Working Order..................... 99.7 ’’
Tender ’’ ’’ ..................... 102 ’’
Total ’’ ’’ ..................... 201.7 ’’
The original PS.11 4-6-2 Pacific was the standard express passenger locomotive of the late Central Argentine Railway, now the Bartolome Mitre Railway. So successful was it that upon nationalisation of the Argentine Railways, the Authorities decided to standardise this class for express passenger service on three railways, the Roca, the Bartolome Mitre, and the San Martin, where very heavy trains and continuous high speeds are a daily occurrence, in consequence an order for 50 additional units, duly modified and modernised, was placed with The Vulcan Foundry.
As a result these locomotives-among the most powerful in the world on a power for adhesive weight basis-are operating express trains of up to 750 tons weight on all three railways, including the seaside expresses between Buenos Aires and Mar del Plata, the " Cuyano " and " Internacional " between Buenos Aires and Mendoza en route for Chile, the sleeping car traffic from the Cordoba hills, and the business expresses between Buenos Aires and Rosario.
One of the original locomotives created a South American speed record in 1939 by averaging 65.7 m.p.h. with 500 tons on the non-stop run of 188 miles between Rosario and Buenos Aires, during which a maximum speed of nearly 100mph was attained.
The General San Martin railway had many NBL 2-8-0s. 23 is one fitted with Stephenson valve gear, it was another loco built in 1907 and is seen above at Alianza, Buenos Aires .
Withdrawn but looking in good order at Tres Arroyos on the 5'6'' General Roca was 7D 2-6-0 3102 coming from Beyer Peacock in 1912, for secondary and branch line work. The whole class of 22 was extant until 1970.
Three generations of British locos on the Roca at Tres Arroyos. Left is 4-6-0 3213 from Beyer Peacock in 1905, originally a compound; right, 3957 a later Beyer Peacock, from 1913; just visible in the background is 4-8-0 1582 built at Vulcan Foundry in 1949.