This Mountain trio bore the second lightest weight of any 4-8-2s supplied to a North American railroad, according to Drury.
| Specifications | |
|---|---|
| Class | 200 / 500 |
| Locobase ID | 6909 |
| Railroad | New Orleans Great Northern (GM&O) |
| Whyte | 4-8-2 |
| Road Numbers | 200-202, 500-502 |
| Gauge | Std |
| Builder | Alco |
| Year | 1927 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 16.75' |
| Engine Wheelbase | 37' |
| Ratio of driving wheelbase to overall engine wheebase | 0.45 |
| Overall Wheelbase (engine & tender) | 69.94' |
| Axle Loading (Maximum Weight per Axle) | 47750 lbs |
| Weight on Drivers | 191000 lbs |
| Engine Weight | 272500 lbs |
| Tender Light Weight | 175400 lbs |
| Total Engine and Tender Weight | 447900 lbs |
| Tender Water Capacity | 9000 gals |
| Tender Fuel Capacity (oil/coal) | 16 tons |
| Minimum weight per yard of rail on which locomotive could run | 79.58 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 63" |
| Boiler Pressure | 225 psi |
| Cylinders (dia x stroke) | 24" x 28" |
| Tractive Effort | 48960 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.90 |
| Heating Ability | |
| Firebox Area | 258 sq. ft |
| Grate Area | 59.90 sq. ft |
| Evaporative Heating Surface | 2832 |
| Superheating Surface | 600 |
| Combined Heating Surface | 3432 |
| Evaporative Heating Surface/Cylinder Volume | 193.17 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 13477.50 |
| Same as above plus superheater percentage | 15833.71 |
| Same as above but substitute firebox area for grate area | 68198.60 |
| Power L1 | 15344.17 |
| Power MT | 708.44 |
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