Minneapolis & St Louis 4-6-2 "Pacific" Locomotives of 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 Raildata collection. 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.

Specifications by Steve Llanso of Sweat House Media
ClassK1-32
Locobase ID6528
RailroadMinneapolis & St Louis (MSL)
CountryUSA
Whyte4-6-2
Number in Class5
Road Numbers500-504
GaugeStd
Number Built5
BuilderAlco-Brooks
Year1920
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase (ft)12.50
Engine Wheelbase (ft)32.92
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender) (ft)62.83
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)137,000
Engine Weight (lbs)225,000
Tender Loaded Weight (lbs)165,500
Total Engine and Tender Weight (lbs)390,500
Tender Water Capacity (gals)8500
Tender Fuel Capacity (oil/coal) (gals/tons)11
Minimum weight of rail (calculated) (lb/yd)76
Geometry Relating to Tractive Effort
Driver Diameter (in)69
Boiler Pressure (psi)190
High Pressure Cylinders (dia x stroke) (in)22" x 28"
Tractive Effort (lbs)31,720
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.32
Heating Ability
Firebox Area (sq ft)190
Grate Area (sq ft)48.80
Evaporative Heating Surface (sq ft)2346
Superheating Surface (sq ft)560
Combined Heating Surface (sq ft)2906
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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