Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 66, pp. 118. Works number were 55028-55029 in September 1921.
Like most of the 1921 Baldwins bought by Colombian railways, the design of these Consolidations was constrained by the light and tight alignments of their operating areas and the difficulty in transporting the engines to their railways. The railway needed a small locomotive (gross engine weight was limited to 77,140 lb/34,490 kg). Small pieces were to be shipped cases weighing no more than 100 kg (220 lb) and the 8" (203 mm) piston valves were to be "as light as possible."
If anything, the specifications show that assigning 2-8-0s to "passenger and freight" service indicated an emphasis on getting there rather than getting there quickly. Rail weighed 40 lb/yard (20 kg/metre), ruling grades were 3% compensated, and curve radii were a tight 279 feet (85 metres) or 20 1/2 degrees. Also, the engines were expected to operate at altitudes of 2,600 metres (8,530 feet).
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 11 |
| Locobase ID | 15018 |
| Railroad | Sur de Colombia |
| Country | Colombia |
| Whyte | 2-8-0 |
| Number in Class | 2 |
| Road Numbers | 11-12 / 38-39 |
| Gauge | Metre |
| Number Built | 2 |
| Builder | Baldwin |
| Year | 1921 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 10.17 / 3.10 |
| Engine Wheelbase (ft / m) | 16.92 / 5.16 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.60 |
| Overall Wheelbase (engine & tender) (ft / m) | 42.06 / 12.82 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 67,000 / 30,391 |
| Engine Weight (lbs / kg) | 77,000 / 34,927 |
| Tender Loaded Weight (lbs / kg) | 50,000 / 22,680 |
| Total Engine and Tender Weight (lbs / kg) | 127,000 / 57,607 |
| Tender Water Capacity (gals / ML) | 2400 / 9.09 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.30 / 3 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 28 / 14 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 37 / 940 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 18" / 381x457 |
| Tractive Effort (lbs / kg) | 16,747 / 7596.32 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.00 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 60 - 2" / 51 |
| Flues (number - dia) (in / mm) | 10 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 14 / 4.27 |
| Firebox Area (sq ft / m2) | 60 / 5.57 |
| Grate Area (sq ft / m2) | 16.50 / 1.53 |
| Evaporative Heating Surface (sq ft / m2) | 693 / 64.38 |
| Superheating Surface (sq ft / m2) | 166 / 15.42 |
| Combined Heating Surface (sq ft / m2) | 859 / 79.80 |
| Evaporative Heating Surface/Cylinder Volume | 188.24 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2970 |
| Same as above plus superheater percentage | 3534 |
| Same as above but substitute firebox area for grate area | 12,852 |
| Power L1 | 7498 |
| Power MT | 986.88 |