Boiler had feedwater heater. Only 15 "Heavy" mountains entered service under the USRA aegis. Baldwin built two engines for the C&O, Alco-Brooks supplied three more to the C&O as well as 10 more to the N&W. LeMassena argues, however, that this particular design influenced not only 4-8-2 designs, but also encouraged the development of the larger 4-8-4.
Standard light "Mountain" design as conceived for mass production during World War I. Four railroads bought 47 locomotives, 25 going to the Southern. Baldwin built 15 (for the Southern), Alco-Richmond supplied 15, and Alco-Schenectady delivered 17 to the MoPac and the Southern. Most later Mountains had a higher superheater to evaporative heating surface ratio and a higher boiler pressure.
| Specifications | ||
|---|---|---|
| Class | Heavy | Light |
| Locobase ID | 232 | 231 |
| Railroad | USRA | USRA |
| Whyte | 4-8-2 | 4-8-2 |
| Road Numbers | 10000 | 10000 |
| Gauge | Std | Std |
| Builder | Several | Several |
| Year | 1918 | 1918 |
| Valve Gear | Baker | Baker |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 18.25' | 18.25' |
| Engine Wheelbase | 40' | 40' |
| Ratio of driving wheelbase to overall engine wheebase | 0.46 | 0.46 |
| Overall Wheelbase (engine & tender) | 75.70' | 75.70' |
| Axle Loading (Maximum Weight per Axle) | 56500 lbs | |
| Weight on Drivers | 243000 lbs | 224500 lbs |
| Engine Weight | 352500 lbs | 327000 lbs |
| Tender Light Weight | 194200 lbs | 193700 lbs |
| Total Engine and Tender Weight | 546700 lbs | 520700 lbs |
| Tender Water Capacity | 10000 gals | 10000 gals |
| Tender Fuel Capacity (oil/coal) | 16 tons | 16 tons |
| Minimum weight per yard of rail on which locomotive could run | 101.25 lb rail | 93.54 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 69" | 69" |
| Boiler Pressure | 200 psi | 200 psi |
| Cylinders (dia x stroke) | 28" x 30" | 27" x 30" |
| Tractive Effort | 57948 lbs | 53883 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.19 | 4.17 |
| Heating Ability | ||
| Firebox Area | 373 sq. ft | 348 sq. ft |
| Grate Area | 76.30 sq. ft | 70.30 sq. ft |
| Evaporative Heating Surface | 4666 | 4121 |
| Superheating Surface | 1085 | 966 |
| Combined Heating Surface | 5751 | 5087 |
| Evaporative Heating Surface/Cylinder Volume | 218.24 | 207.29 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 15260 | 14060 |
| Same as above plus superheater percentage | 18138.99 | 16729.94 |
| Same as above but substitute firebox area for grate area | 88674.25 | 82816.75 |
| Power L1 | 17530.54 | 16838.95 |
| Power MT | 636.18 | 661.44 |
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