These engines had 41 sq ft of arch tubes to contribute to firebox heating surface. Their steam distribution flowed through 15" piston valves on the HP cylinders (and slide valves on the big LP jugs).
They could handle curves with a radius of 103 yards and were used as pushers over the Cumberland mountains on grades of up to 2.35%.
| Specifications | |
|---|---|
| Class | M-1-99 |
| Locobase ID | 322 |
| Railroad | Nashville, Chattanooga & St. Louis |
| Whyte | 2-8-8-2 |
| Road Numbers | 900-902 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1915 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 15' |
| Engine Wheelbase | 40.33' |
| Ratio of driving wheelbase to overall engine wheebase | 0.37 |
| Overall Wheelbase (engine & tender) | 85.96' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 430000 lbs |
| Engine Weight | 470000 lbs |
| Tender Light Weight | 165600 lbs |
| Total Engine and Tender Weight | 635600 lbs |
| Tender Water Capacity | 8500 gals |
| Tender Fuel Capacity (oil/coal) | 13 tons |
| Minimum weight per yard of rail on which locomotive could run | 89.58 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 56" |
| Boiler Pressure | 210 psi |
| Cylinders (dia x stroke) | 27" x 30" |
| Low Pressure Cylinders (dia x stroke) | 41" x 30" |
| Tractive Effort | 97248 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.42 |
| Heating Ability | |
| Firebox Area | 396 sq. ft |
| Grate Area | 85.50 sq. ft |
| Evaporative Heating Surface | 5448 |
| Superheating Surface | 1240 |
| Combined Heating Surface | 6688 |
| Evaporative Heating Surface/Cylinder Volume | 274.04 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 17955 |
| Same as above plus superheater percentage | 21283.98 |
| Same as above but substitute firebox area for grate area | 98578.42 |
| Power L1 | 7947.37 |
| Power MT | 325.97 |
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