Buenos Aires Great Southern class 8C
In 1913, Robert Stephenson & Co. delivered ten 2-6-2T tank locomotives to the Ferrocarril del Sud de Buenos Aires which had the works numbers 3471 to 3480. The specifications came from Messrs. Livesey, Son & Henderson. North British delivered 31 more of the same design in the same and the following year. These carried the works numbers 20186 to 20216. They were designated clase 8C and carried the numbers 3451 to 3490.
Essentially, they were the tank version of the 2-6-0 clase 7D built by Beyer-Peacock in 1912. Like these, they were oil-fired and superheated. With the same driver diameter of 5 ft 8 in, they had the largest wheels of any 2-6-2T of the BAGS. The majority of the class was used in suburban service around Buenos Aires. Some were used in Bahia Blanca and Tandil.
Technical data
General
- Built
- 1913-1914
- Manufacturers
- Robert Stephenson & Co., North British
- Wheel arrangement
- 2-6-2T (Prairie)
- Gauge
- 1,676 mm (Indian broad gauge)
Dimensions and weights
- Wheelbase
- 9.27 m
- Service mass
- 77.7 t
- Adhesion mass
- 50 t
- Rigid wheelbase
- 3.96 m
- Axle load
- 16.7 t
- Water capacity
- 9,093 l
- Fuel capacity
- 4,501 l (oil)
Boiler
- Grate area
- 2.05 m²
- Firebox surface
- 11.4 m²
- Tube heating surface
- 95.717 m²
- Evaporative heating surface
- 107.117 m²
- Superheater surface
- 22.483 m²
- Total heating surface
- 129.6 m²
Power plant
- Driver diameter
- 1,727 mm
- Boiler pressure
- 11 bar
- Expansion type
- simple expansion
- Cylinders
- two, 483 x 660 mm
Power
- Power source
- steam
- Estimated power
- 671 kW (912 PS)
- Starting effort
- 83.5 kN
Calculated values
- Factor of adhesion
- 1 : 5.87
- Optimal speed
- 50 km/h
- Power-to-weight ratio
- 8.6 kW/t
- Heating Surface Equivalent
- 209.1 m²
- Cylinder volume/HSE
- 1 : 1,155.53
- Adhesive weight/Total
- 1 : 1.55
- Tractive force/Heating surface
- 1 : 13.46
- Grate area/Heating surface
- 1 : 63.22
- Firebox/Tube surface
- 1 : 8.40
- Total/Superheater
- 1 : 4.76
