Minneapolis, St Paul & Sault Ste Marie 2-6-2 "Prairie" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class J (Locobase 8741)

Data from Soo Miscellaneous Steam Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

These were the only Prairies to be bought by the Soo and they were pretty rare birds. They arrived as cross-compounds. Both cylinders had 26" strokes; the HP cylinder diameter measured 22", the LP a lusty 35" across. At some later date, these engines were simpled and superheated; those dimensions are shown in the specs.

Specifications by Steve Llanso of Sweat House Media
ClassJ
Locobase ID8741
RailroadMinneapolis, St Paul & Sault Ste Marie (Soo)
CountryUSA
Whyte2-6-2
Number in Class10
Road Numbers800-809
GaugeStd
Number Built10
BuilderAlco-Schenectady
Year1907
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase11.33'
Engine Wheelbase20.25'
Ratio of driving wheelbase to overall engine wheebase 0.56
Overall Wheelbase (engine & tender)55.67'
Axle Loading (Maximum Weight per Axle)48760 lbs
Weight on Drivers132760 lbs
Engine Weight181320 lbs
Tender Light Weight128810 lbs
Total Engine and Tender Weight310130 lbs
Tender Water Capacity6000 gals
Tender Fuel Capacity (oil/coal)10 tons
Minimum weight of rail (calculated)74 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"
Boiler Pressure185 psi
Cylinders (dia x stroke)22.5" x 26"
Tractive Effort32854 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.04
Heating Ability
Firebox Area165 sq. ft
Grate Area38.36 sq. ft
Evaporative Heating Surface1716 sq. ft
Superheating Surface347 sq. ft
Combined Heating Surface2063 sq. ft
Evaporative Heating Surface/Cylinder Volume143.42
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7097
Same as above plus superheater percentage8303
Same as above but substitute firebox area for grate area35714
Power L19195
Power MT458.08


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