Quoting a Northern Pacific "Tell Tale" article from its February 1950 issue, the site says that these two decapods (works #8168-8169) were intended for heavy freight service in the Cascade mountains and were the heaviest locomotives in the world at the time they entered service. They were later converted to yard switchers.
| Specifications | |
|---|---|
| Class | M |
| Locobase ID | 800 |
| Railroad | Northern Pacific (NP) |
| Whyte | 2-10-0 |
| Road Numbers | 1-2 |
| Gauge | Std |
| Builder | Burnham, Parry, Williams & Co |
| Year | 1886 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase | 16.50' |
| Engine Wheelbase | 24.33' |
| Ratio of driving wheelbase to overall engine wheebase | 0.68 |
| Overall Wheelbase (engine & tender) | 49.17' |
| Axle Loading (Maximum Weight per Axle) | 27000 lbs |
| Weight on Drivers | 130540 lbs |
| Engine Weight | 134020 lbs |
| Tender Light Weight | 137300 lbs |
| Total Engine and Tender Weight | 271320 lbs |
| Tender Water Capacity | 7000 gals |
| Tender Fuel Capacity (oil/coal) | 12 tons |
| Minimum weight per yard of rail on which locomotive could run | 44 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 46" |
| Boiler Pressure | 150 psi |
| Cylinders (dia x stroke) | 22" x 26" |
| Tractive Effort | 34880 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.74 |
| Heating Ability | |
| Firebox Area | 190 sq. ft |
| Grate Area | 35.70 sq. ft |
| Evaporative Heating Surface | 2337 |
| Superheating Surface | |
| Combined Heating Surface | 2337 |
| Evaporative Heating Surface/Cylinder Volume | 204.30 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5355 |
| Same as above plus superheater percentage | 5355 |
| Same as above but substitute firebox area for grate area | 28500 |
| Power L1 | 3304 |
| Power MT | 279.00 |
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