Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 28, p. 83. Works numbers were 25985, 26076 in July 1905; 26283 in August; 26495 in September; 26927 in November; and 27020 in December.
These Moguls sported big fireboxes for the gauge and wheel arrangement, although the evaporative heating surface area was only moderate. They also carried a lot of adhesion weight.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 12 |
| Locobase ID | 12819 |
| Railroad | United Fruit |
| Country | Guatemala |
| Whyte | 2-6-0 |
| Number in Class | 6 |
| Road Numbers | 12-17 |
| Gauge | 3' |
| Number Built | 6 |
| Builder | Burnham, Williams & Co |
| Year | 1905 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 11.50 / 3.51 |
| Engine Wheelbase (ft / m) | 18.75 / 5.71 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.61 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 68,000 / 30,844 |
| Engine Weight (lbs / kg) | 78,000 / 35,380 |
| Tender Loaded Weight (lbs / kg) | 52,000 / 23,587 |
| Total Engine and Tender Weight (lbs / kg) | 130,000 / 58,967 |
| Tender Water Capacity (gals / ML) | 2600 / 9.85 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 38 / 19 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 48 / 1219 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 20" / 406x508 |
| Tractive Effort (lbs / kg) | 16,320 / 7402.64 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.17 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 160 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 9.56 / 2.91 |
| Firebox Area (sq ft / m2) | 93.70 / 8.71 |
| Grate Area (sq ft / m2) | 15.20 / 1.41 |
| Evaporative Heating Surface (sq ft / m2) | 921 / 85.59 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 921 / 85.59 |
| Evaporative Heating Surface/Cylinder Volume | 197.89 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2736 |
| Same as above plus superheater percentage | 2736 |
| Same as above but substitute firebox area for grate area | 16,866 |
| Power L1 | 4299 |
| Power MT | 418.13 |