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 | |
---|---|
Class | 70 |
Locobase ID | 15278 |
Railroad | Argentine State |
Country | Argentina |
Whyte | 2-8-2 |
Number in Class | 4 |
Road Numbers | 70-73 |
Gauge | Std |
Number Built | 4 |
Builder | Baldwin |
Year | 1924 |
Valve Gear | Walschaert |
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 Volume | 222.68 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 4590 |
Same as above plus superheater percentage | 5416 |
Same as above but substitute firebox area for grate area | 29,524 |
Power L1 | 9851 |
Power MT | 819.54 |