Data from "Articulated Compound Locomotives for Santo Domingo", Railroad Age Gazette, Volume XLV [45], No 26, (27 November 1908) pp. 1444-1446. See also DeGolyer, Volume 32, p. 314. Works number was 33008.
This was one of the smallest Baldwin-built Mallets delivered. RG commented: "This design is interesting, as an example of a relatively powerful locomotive with flexible wheel base and minimum axle loads."
The Prairie Mallet went into service on a Porcella, Vicini & Company plantation in the DR that had 25-lb rail and a minimum curve radius of 125 ft. A wood (or, more likely, sugar cane) burner, the diminuitive engine sported the requisite cabbage stack and an oversized cab. Each truck was equalized with its adjacent engine set. Tender capacity in wood was 1 1/2 cords.
During this Mallet's construction, someone recorded a note in Baldwin's spec book to the effect that "...last engine [a 2-6-0] arrived with leaky boiler. Special attention is called to the new engine to see that boiler and other details give no cause for complaint."
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Milan |
| Locobase ID | 4189 |
| Railroad | Ingenio Angelina |
| Country | Dominican Republic |
| Whyte | 2-6-6-2 |
| Number in Class | 1 |
| Road Numbers | 9 |
| Gauge | 2'6" |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1908 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6 / 1.83 |
| Engine Wheelbase (ft / m) | 27 / 8.23 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.22 |
| Overall Wheelbase (engine & tender) (ft / m) | 43.80 / 13.35 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 50,900 / 23,088 |
| Engine Weight (lbs / kg) | 60,200 / 27,306 |
| Tender Loaded Weight (lbs / kg) | 24,800 / 11,249 |
| Total Engine and Tender Weight (lbs / kg) | 85,000 / 38,555 |
| Tender Water Capacity (gals / ML) | 1200 / 4.55 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 14 / 7 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 33 / 838 |
| Boiler Pressure (psi / kPa) | 184.20 / 1270 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 10" x 16" / 254x406 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 15" x 16" / 381x406 |
| Tractive Effort (lbs / kg) | 10,511 / 4767.72 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.84 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 88 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 12.50 / 3.81 |
| Firebox Area (sq ft / m2) | 49 / 4.55 |
| Grate Area (sq ft / m2) | 9.40 / 0.87 |
| Evaporative Heating Surface (sq ft / m2) | 550 / 51.12 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 550 / 51.12 |
| Evaporative Heating Surface/Cylinder Volume | 378.15 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1731 |
| Same as above plus superheater percentage | 1731 |
| Same as above but substitute firebox area for grate area | 9026 |
| Power L1 | 2461 |
| Power MT | 639.56 |