Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Methodist University Volume 12, p. 119 and Volume 17, p. 5. Works numbers were 7482 in October 1884 and 11832-11833 in April 1891.
One has to conclude that this little tank design had some special qualities as far as the PA&U was concerned. The second and third were ordered seven years after the first.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 9 |
| Locobase ID | 11831 |
| Railroad | Porto Alegre a Uruguayana |
| Country | Brazil |
| Whyte | 2-4-2ST |
| Number in Class | 3 |
| Road Numbers | 9, 39-40 / 43, 11-12 |
| Gauge | Metre |
| Number Built | 3 |
| Builder | Burnham, Parry, Williams & Co |
| Year | 1884 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 5 / 1.52 |
| Engine Wheelbase (ft / m) | 18.50 / 5.64 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.27 |
| Overall Wheelbase (engine & tender) (ft / m) | 18.50 / 5.64 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 28,000 / 12,701 |
| Engine Weight (lbs / kg) | 42,000 / 19,051 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 42,000 / 19,051 |
| Tender Water Capacity (gals / ML) | 550 / 2.08 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 23 / 11.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 41 / 1041 |
| Boiler Pressure (psi / kPa) | 130 / 900 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 11" x 16" / 279x406 |
| Tractive Effort (lbs / kg) | 5218 / 2366.85 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.37 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 92 - 1.5" / 38 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 8.17 / 2.49 |
| Firebox Area (sq ft / m2) | 51.50 / 4.78 |
| Grate Area (sq ft / m2) | 8.72 / 0.81 |
| Evaporative Heating Surface (sq ft / m2) | 345 / 32.05 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 345 / 32.05 |
| Evaporative Heating Surface/Cylinder Volume | 196.04 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1134 |
| Same as above plus superheater percentage | 1134 |
| Same as above but substitute firebox area for grate area | 6695 |
| Power L1 | 3041 |
| Power MT | 478.87 |