Argentine State 2-8-2 Locomotives in Argentina


Class Details by Steve Llanso of Sweat House Media

Class 70 (Locobase 15278)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 72, pp. 187+. Works numbers were 57602-57605 in January 1924.

Using the same power dimensions as many North American logging Mikados, this wood-burning quartet pulled the Argentine State's freight service on 75 lb/yard (37.5 kg/metre) track that curved gently (radii of 984 feet/300 m) and rose gradually (ruling grade of 0.95%). Their superheaters meant 8" (203 mm) piston valves to convey the hotter steam to the cylinders.

Principal Dimensions by Steve Llanso of Middle Run Media
Class70
Locobase ID15278
RailroadArgentine State
CountryArgentina
Whyte2-8-2
Number in Class4
Road Numbers70-73
GaugeStd
Number Built4
BuilderBaldwin
Year1924
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)27.58 / 8.41
Ratio of driving wheelbase to overall engine wheelbase 0.44
Overall Wheelbase (engine & tender) (ft / m)46.46 / 14.16
Axle Loading (Maximum Weight per Axle) (lbs / kg)26,455 / 14,225
Weight on Drivers (lbs / kg)106,000 / 48,081
Engine Weight (lbs / kg)138,000 / 62,596
Tender Loaded Weight (lbs / kg)101,000 / 45,813
Total Engine and Tender Weight (lbs / kg)239,000 / 108,409
Tender Water Capacity (gals / ML)5000 / 18.94
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)44 / 22
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)180 / 1240
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)27,039 / 12264.70
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.92
Heating Ability
Tubes (number - dia) (in / mm)164 - 2" / 51
Flues (number - dia) (in / mm)24 - 5.375" / 137
Flue/Tube length (ft / m)12.08 / 3.68
Firebox Area (sq ft / m2)139 / 12.91
Grate Area (sq ft / m2)25.50 / 2.37
Evaporative Heating Surface (sq ft / m2)1574 / 146.23
Superheating Surface (sq ft / m2)334
Combined Heating Surface (sq ft / m2)1908 / 146.23
Evaporative Heating Surface/Cylinder Volume222.68
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4590
Same as above plus superheater percentage5416
Same as above but substitute firebox area for grate area29,524
Power L19851
Power MT819.54

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