Data from DeGolyer, Volume 78, p. 88+. Works numbers were 58826-58828 in November 1925.
This trio of saddle-tanks was bought to support construction of the Lake Guajataca Reservoir in northwestern Puerto Rico. They faced predictably tight limits as they traveled on 30 and 40 lb/yard (15 and 20 kg/metre) rail around almost impossibly tight curves with radii of 60 feet.
Constructed by the Puerto Rico Electric Power Authority (PREPA), the dam that created the reservoir was completed in 1929.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 1 |
| Locobase ID | 15359 |
| Railroad | Isabela Irrigation Service |
| Country | USA-Puerto Rico |
| Whyte | 0-4-0ST |
| Number in Class | 3 |
| Road Numbers | 1-3 |
| Gauge | 2'6" |
| Number Built | 3 |
| Builder | Baldwin |
| Year | 1925 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 4 / 1.22 |
| Engine Wheelbase (ft / m) | 4 / 1.22 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 4 / 1.22 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 20,000 / 9072 |
| Engine Weight (lbs / kg) | 20,000 / 9072 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 300 / 1.14 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 17 / 8.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 26 / 660 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 8" x 14" / 203x356 |
| Tractive Effort (lbs / kg) | 4687 / 2125.99 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.27 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 46 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 7 / 2.13 |
| Firebox Area (sq ft / m2) | 24 / 2.23 |
| Grate Area (sq ft / m2) | 4.50 / 0.42 |
| Evaporative Heating Surface (sq ft / m2) | 170 / 15.79 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 170 / 15.79 |
| Evaporative Heating Surface/Cylinder Volume | 209.88 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 720 |
| Same as above plus superheater percentage | 720 |
| Same as above but substitute firebox area for grate area | 3840 |
| Power L1 | 2482 |
| Power MT | 547.19 |