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 |