Four were unaltered and scrapped as Ten-wheelers in April and May 1937. The other six were converted to H-1-class Pacifics (see Locobase 8846) and served into the 1950s.
| Specifications | |
|---|---|
| Class | D-1 |
| Locobase ID | 8845 |
| Railroad | Spokane, Portland & Seattle |
| Whyte | 4-6-0 |
| Road Numbers | 100-109 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1910 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 15.50' |
| Engine Wheelbase | 28.96' |
| Ratio of driving wheelbase to overall engine wheebase | 0.54 |
| Overall Wheelbase (engine & tender) | 61.50' |
| Axle Loading (Maximum Weight per Axle) | 52500 lbs |
| Weight on Drivers | 155000 lbs |
| Engine Weight | 210000 lbs |
| Tender Light Weight | 148200 lbs |
| Total Engine and Tender Weight | 358200 lbs |
| Tender Water Capacity | 8000 gals |
| Tender Fuel Capacity (oil/coal) | 13 tons |
| Minimum weight per yard of rail on which locomotive could run | 86.11 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 73" |
| Boiler Pressure | 200 psi |
| Cylinders (dia x stroke) | 23.5" x 30" |
| Tractive Effort | 38582 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.02 |
| Heating Ability | |
| Firebox Area | 201 sq. ft |
| Grate Area | 55 sq. ft |
| Evaporative Heating Surface | 3370 |
| Superheating Surface | 530 |
| Combined Heating Surface | 3900 |
| Evaporative Heating Surface/Cylinder Volume | 223.77 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 11000 |
| Same as above plus superheater percentage | 12494.87 |
| Same as above but substitute firebox area for grate area | 45663.08 |
| Power L1 | 14775.84 |
| Power MT | 630.49 |
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