Serviceable passenger engines for the light-density network operated by the M & St L. Their Stephenson valve gear and slide valves remained unchanged until their retirements in 1937.
| Specifications | |
|---|---|
| Class | D9-24 |
| Locobase ID | 9020 |
| Railroad | Minneapolis & St Paul (MSL) |
| Whyte | 4-4-0 |
| Road Numbers | 115-116 / 156-157 |
| Gauge | Std |
| Builder | Alco |
| Year | 1906 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase | 8.50' |
| Engine Wheelbase | 23.92' |
| Ratio of driving wheelbase to overall engine wheebase | 0.36 |
| Overall Wheelbase (engine & tender) | 62.91' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 98500 lbs |
| Engine Weight | 144500 lbs |
| Tender Light Weight | 124300 lbs |
| Total Engine and Tender Weight | 268800 lbs |
| Tender Water Capacity | 5500 gals |
| Tender Fuel Capacity (oil/coal) | 12 tons |
| Minimum weight per yard of rail on which locomotive could run | 82 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 69" |
| Boiler Pressure | 200 psi |
| Cylinders (dia x stroke) | 19.5" x 26" |
| Tractive Effort | 24358 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.04 |
| Heating Ability | |
| Firebox Area | 191 sq. ft |
| Grate Area | 30.10 sq. ft |
| Evaporative Heating Surface | 2007 |
| Superheating Surface | |
| Combined Heating Surface | 2007 |
| Evaporative Heating Surface/Cylinder Volume | 223.32 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 6020 |
| Same as above plus superheater percentage | 6020 |
| Same as above but substitute firebox area for grate area | 38200 |
| Power L1 | 7580 |
| Power MT | 339.31 |
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