Minneapolis & St Louis 4-6-2 "Pacific" Locomotives in the USA
Class Details by Steve Llanso of Sweat House Media
Class K1-32 (Locobase 6528)
Data from M&StL 1934 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Superheater area is an estimate based on similar locomotives with the same flue arrangement, adjusted for length.
Pacifics of modest dimensions purchased to pull the North Star Limited. Lyndon Groth (of the [
] -- Minneapolis & St. Louis/Iowa Central/Chicago & Northwestern Website -- accessed 2 January 2008) gives us some detail about one engine in particular:"The 502 was the pride of M&StL President Lucian Sprague, who would occasionally take the throttle. She participated in the pageant at the Chicago Railroad Fair in September 1949 and went from the fair to the scrapper. In Gene Green's book "Minneapolis & St. Louis In Color" it is noted that 502 had been on the ground many times and as a result the frame had been patched so many times she had truly reached the end of the line."
The M & St L went for gas-electric doodlebugs for their meager passenger service and these locomotives were gradually retired beginning in 1939. The last K1 went out of service a decade later in 1949.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | K1-32 |
| Locobase ID | 6528 |
| Railroad | Minneapolis & St Louis (MSL) |
| Country | USA |
| Whyte | 4-6-2 |
| Number in Class | 5 |
| Road Numbers | 500-504 |
| Gauge | Std |
| Number Built | 5 |
| Builder | Alco-Brooks |
| Year | 1920 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.50 / 3.81 |
| Engine Wheelbase (ft / m) | 32.92 / 10.03 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.38 |
| Overall Wheelbase (engine & tender) (ft / m) | 62.83 / 19.15 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 137,000 / 62,142 |
| Engine Weight (lbs / kg) | 225,000 / 102,058 |
| Tender Loaded Weight (lbs / kg) | 165,500 / 75,070 |
| Total Engine and Tender Weight (lbs / kg) | 390,500 / 177,128 |
| Tender Water Capacity (gals / ML) | 8500 / 32.20 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 11 / 10 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 76 / 38 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 69 / 1753 |
| Boiler Pressure (psi / kPa) | 190 / 1310 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 22" x 28" / 559x711 |
| Tractive Effort (lbs / kg) | 31,720 / 14387.97 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.32 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 130 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 26 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 19 / 5.79 |
| Firebox Area (sq ft / m2) | 190 / 17.66 |
| Grate Area (sq ft / m2) | 48.80 / 4.54 |
| Evaporative Heating Surface (sq ft / m2) | 2346 / 218.03 |
| Superheating Surface (sq ft / m2) | 560 / 52.04 |
| Combined Heating Surface (sq ft / m2) | 2906 / 270.07 |
| Evaporative Heating Surface/Cylinder Volume | 190.42 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 9272 |
| Same as above plus superheater percentage | 11,034 |
| Same as above but substitute firebox area for grate area | 42,959 |
| Power L1 | 14,784 |
| Power MT | 713.72 |