Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 31, p. 13 and Vol 49, p. 71. Works numbers were 31705 in September 1907 and 33594 in July 1909.
The specifications called for this little tanks to squirm around curves as tight as 47 degrees (126 feet/38.4 metre radii). Both engines were ordered by Ernst Wiener Company on behalf of the Trujillo & Mercado.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 1 |
| Locobase ID | 14178 |
| Railroad | Central Rufina |
| Country | USA |
| Whyte | 0-4-4T |
| Number in Class | 2 |
| Road Numbers | 1-2 |
| Gauge | Metre |
| Number Built | 2 |
| Builder | Burnham, Williams & Co |
| Year | 1907 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 4.50 / 1.37 |
| Engine Wheelbase (ft / m) | 14.58 / 4.44 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.31 |
| Overall Wheelbase (engine & tender) (ft / m) | 14.58 / 4.44 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 21,500 / 9752 |
| Engine Weight (lbs / kg) | 35,000 / 15,876 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 35,000 |
| Tender Water Capacity (gals / ML) | 600 / 2.27 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 18 / 9 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 33 / 838 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 9" x 16" / 229x406 |
| Tractive Effort (lbs / kg) | 5007 / 2271.14 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.29 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 68 - 1.5" / 38 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 7.54 / 2.30 |
| Firebox Area (sq ft / m2) | 26.20 / 2.43 |
| Grate Area (sq ft / m2) | 5 / 0.46 |
| Evaporative Heating Surface (sq ft / m2) | 226 / 21 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 226 / 21 |
| Evaporative Heating Surface/Cylinder Volume | 191.53 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 750 |
| Same as above plus superheater percentage | 750 |
| Same as above but substitute firebox area for grate area | 3930 |
| Power L1 | 2496 |
| Power MT | 511.88 |