Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 66, p. 185+ and Vol 72, pp. 88+. Works numbers were 54261-54262 in January 1921 and 58044 in September 1924.
All Huancayo a Ayacucho locomotives were subject to two stringent demands: the ability to handle curves radii of 50 metre (164 feet) or 35 1/2 degrees and the ability to operate at altitudes up to 15,000 feet (4,572 metres).
A 9 May 1924 note in the 4's spec advises raising the question of "raising boiler to give more clearance for spring links and decreasing depth of fire box and improve design of frame."
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 2 |
| Locobase ID | 14381 |
| Railroad | Huancayo a Ayacucho |
| Country | Peru |
| Whyte | 2-6-0 |
| Number in Class | 3 |
| Road Numbers | 2-4 |
| Gauge | 3' |
| Number Built | 3 |
| Builder | Baldwin |
| Year | 1921 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8 / 2.44 |
| Engine Wheelbase (ft / m) | 16.33 / 4.98 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.49 |
| Overall Wheelbase (engine & tender) (ft / m) | 43.15 / 13.15 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 74,000 / 33,566 |
| Engine Weight (lbs / kg) | 83,000 / 37,648 |
| Tender Loaded Weight (lbs / kg) | 62,000 / 28,123 |
| Total Engine and Tender Weight (lbs / kg) | 145,000 / 65,771 |
| Tender Water Capacity (gals / ML) | 3000 / 11.36 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1500 / 5678 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 41 / 20.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 43 / 1092 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 20" / 432x508 |
| Tractive Effort (lbs / kg) | 18,281 / 8292.13 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.05 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 123 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 14 / 4.27 |
| Firebox Area (sq ft / m2) | 86 / 7.99 |
| Grate Area (sq ft / m2) | 16.90 / 1.57 |
| Evaporative Heating Surface (sq ft / m2) | 1094 / 101.67 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1094 / 101.67 |
| Evaporative Heating Surface/Cylinder Volume | 208.22 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2704 |
| Same as above plus superheater percentage | 2704 |
| Same as above but substitute firebox area for grate area | 13,760 |
| Power L1 | 3326 |
| Power MT | 297.27 |