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 http://www.cashgroth.com/ -- 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 Sweat House Media
Locobase ID6528
RailroadMinneapolis & St Louis (MSL)
Number in Class5
Road Numbers500-504
Number Built5
Valve GearBaker
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 wheebase 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 / ML/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 / 13.10
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
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 Volume190.44
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9272
Same as above plus superheater percentage11,034
Same as above but substitute firebox area for grate area42,959
Power L114,785
Power MT713.77

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