Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 79, pp. 108 See also Jorge Arias de Greiff, Un Momento Estelar de la Ingeniera Mecanica en Colombia: Los Disenos de Locomotoras de PC Dewhurst", Boletin Cultural y Bibliographico, Volumne XXVI, No. 21, 1989, pp.19-29. Works number was 60950 in August 1929.
See Locobase 15367 for a full discussion of PC Dewhurst's thoughts in designing the famed "Docerruedas" (Twelve-wheelers). This small railway joined the host of other Colombian railways in buying the particularly apt design, but couldn't resist tinkering with the boiler, deleting three of the tubes found in other Colombian 4-8-0s and substituting an additional flue for the superheater.
When the Ambalema-IbaguT was nationalized in 1953, the 3 was renumbered 73.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 3 |
| Locobase ID | 15429 |
| Railroad | Ambalema-IbaguT |
| Country | Colombia |
| Whyte | 4-8-0 |
| Number in Class | 1 |
| Road Numbers | 3 / 73 |
| Gauge | 3' |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1929 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.50 / 3.81 |
| Engine Wheelbase (ft / m) | 21.92 / 6.68 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.57 |
| Overall Wheelbase (engine & tender) (ft / m) | 47.40 / 14.45 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 103,000 / 46,720 |
| Engine Weight (lbs / kg) | 128,000 / 58,060 |
| Tender Loaded Weight (lbs / kg) | 72,000 / 32,659 |
| Total Engine and Tender Weight (lbs / kg) | 200,000 / 90,719 |
| Tender Water Capacity (gals / ML) | 3300 / 12.50 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6 / 6 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 43 / 21.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 40 / 1016 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 22" / 457x559 |
| Tractive Effort (lbs / kg) | 27,265 / 12367.21 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.78 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 126 - 2" / 51 |
| Flues (number - dia) (in / mm) | 21 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 13.83 / 4.22 |
| Firebox Area (sq ft / m2) | 106 / 9.85 |
| Grate Area (sq ft / m2) | 32.60 / 3.03 |
| Evaporative Heating Surface (sq ft / m2) | 1422 / 132.11 |
| Superheating Surface (sq ft / m2) | 318 / 29.54 |
| Combined Heating Surface (sq ft / m2) | 1740 / 161.65 |
| Evaporative Heating Surface/Cylinder Volume | 219.46 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5868 |
| Same as above plus superheater percentage | 6924 |
| Same as above but substitute firebox area for grate area | 22,514 |
| Power L1 | 8915 |
| Power MT | 763.27 |