These were the only Prairies to be bought by the Soo and they were pretty rare birds. They arrived as cross-compounds. Both cylinders had 26" strokes; the HP cylinder diameter measured 22", the LP a lusty 35" across. At some later date, these engines were simpled and superheated; those dimensions are shown in the specs.
| Specifications | |
|---|---|
| Class | J |
| Locobase ID | 8741 |
| Railroad | Minneapolis, St Paul & Sault Ste Marie (Soo) |
| Whyte | 2-6-2 |
| Road Numbers | 800-809 |
| Gauge | Std |
| Builder | Alco-Schenectady |
| Year | 1907 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase | 11.33' |
| Engine Wheelbase | 20.25' |
| Ratio of driving wheelbase to overall engine wheebase | 0.56 |
| Overall Wheelbase (engine & tender) | 55.67' |
| Axle Loading (Maximum Weight per Axle) | 48760 lbs |
| Weight on Drivers | 132760 lbs |
| Engine Weight | 181320 lbs |
| Tender Light Weight | 128810 lbs |
| Total Engine and Tender Weight | 310130 lbs |
| Tender Water Capacity | 6000 gals |
| Tender Fuel Capacity (oil/coal) | 10 tons |
| Minimum weight per yard of rail on which locomotive could run | 73.76 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 63" |
| Boiler Pressure | 185 psi |
| Cylinders (dia x stroke) | 22.5" x 26" |
| Tractive Effort | 32854 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.04 |
| Heating Ability | |
| Firebox Area | 165 sq. ft |
| Grate Area | 38.36 sq. ft |
| Evaporative Heating Surface | 1716 |
| Superheating Surface | 347 |
| Combined Heating Surface | 2063 |
| Evaporative Heating Surface/Cylinder Volume | 143.42 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 7096.60 |
| Same as above plus superheater percentage | 8290.26 |
| Same as above but substitute firebox area for grate area | 35659.36 |
| Power L1 | 9195.38 |
| Power MT | 458.10 |
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