Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 24, p. 42. Works numbers were 19497, 19500 in August 1901; 19673-19675 in November.
All of this class were converted in 1916 to 0-8-0 switchers. As such, they were taken into the Southern Pacific in 1924.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 2 |
| Locobase ID | 12522 |
| Railroad | South Western of Arizona (EP&SW) |
| Country | USA |
| Whyte | 2-8-0 |
| Number in Class | 1 |
| Road Numbers | 2-6 / 50-54 / 209-213 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1901 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 14.25 / 4.34 |
| Engine Wheelbase (ft / m) | 22.83 / 6.96 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.62 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 154,000 / 69,853 |
| Engine Weight (lbs / kg) | 170,000 / 77,111 |
| Tender Loaded Weight (lbs / kg) | 100,000 / 45,359 |
| Total Engine and Tender Weight (lbs / kg) | 270,000 / 122,470 |
| Tender Water Capacity (gals / ML) | 5000 / 18.94 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 64 / 32 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 51 / 1295 |
| Boiler Pressure (psi / kPa) | 190 / 1310 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 22" x 28" / 559x711 |
| Tractive Effort (lbs / kg) | 42,915 / 19465.94 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.59 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 300 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 13.83 / 4.22 |
| Firebox Area (sq ft / m2) | 200 / 18.59 |
| Grate Area (sq ft / m2) | 37 / 3.44 |
| Evaporative Heating Surface (sq ft / m2) | 2630 / 244.42 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 2630 / 244.42 |
| Evaporative Heating Surface/Cylinder Volume | 213.47 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 7030 |
| Same as above plus superheater percentage | 7030 |
| Same as above but substitute firebox area for grate area | 38,000 |
| Power L1 | 4758 |
| Power MT | 272.46 |