Data from M&StL 1934 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers were 30271-30272 in August 1906.
Serviceable passenger engines for the light-density network operated by the M&StL. Their Stephenson valve gear and slide valves remained unchanged until their retirements in 1937.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | D9-24 |
| Locobase ID | 9020 |
| Railroad | Minneapolis & St Louis (MSL) |
| Country | USA |
| Whyte | 4-4-0 |
| Number in Class | 2 |
| Road Numbers | 115-116/146-147/156-157 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Alco-Schenectady |
| Year | 1906 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8.50 / 2.59 |
| Engine Wheelbase (ft / m) | 23.92 / 7.29 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.36 |
| Overall Wheelbase (engine & tender) (ft / m) | 62.91 / 19.17 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 98,500 / 44,679 |
| Engine Weight (lbs / kg) | 144,500 / 65,544 |
| Tender Loaded Weight (lbs / kg) | 124,300 / 56,382 |
| Total Engine and Tender Weight (lbs / kg) | 268,800 / 121,926 |
| Tender Water Capacity (gals / ML) | 5500 / 20.83 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 12 / 11 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 82 / 41 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 69 / 1753 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 19.5" x 26" / 495x660 |
| Tractive Effort (lbs / kg) | 24,358 / 11048.62 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.04 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 292 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 12 / 3.66 |
| Firebox Area (sq ft / m2) | 191 / 17.74 |
| Grate Area (sq ft / m2) | 30.10 / 2.80 |
| Evaporative Heating Surface (sq ft / m2) | 2007 / 186.45 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 2007 / 186.45 |
| Evaporative Heating Surface/Cylinder Volume | 223.25 |
| 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 | 38,200 |
| Power L1 | 7578 |
| Power MT | 339.22 |