Klondike Mines 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 12500)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 39, p. 321. See also Ron Simpson's Klondike Mines Railway site at http://copperraildepot.com/KMR-010.htm . Works number was 37564 in March 1912,.

Baldwin's specs showed some of the conditions under which the engine would operated. . The fuel was described as coal of "poor quality that clinkers and cakes". Rail weight was limited to 45 lb/yd (22.5 kg/m), maximum grade amounted to 4%, and curves could bend to 35 degrees.

The 4 had only a short career on the KMR because the road closed 9 months after it was delivered. Apparently stored unused for three decades (yes, 30 years!), the 4 entered a new life on the White Pass & Yukon and operated for 10 years before it was retired. Years later, the 4 was renamed "Hooterville Cannonball".

As of Ron Simpson's latest entry, the HC rested in storage in Adair, Okla.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12500
RailroadKlondike Mines
Number in Class1
Road Numbers4
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase8'
Engine Wheelbase22.67'
Ratio of driving wheelbase to overall engine wheebase 0.35
Overall Wheelbase (engine & tender)42.12'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers56000 lbs
Engine Weight77000 lbs
Tender Light Weight38000 lbs
Total Engine and Tender Weight115000 lbs
Tender Water Capacity
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)31 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter37"
Boiler Pressure145 psi
Cylinders (dia x stroke)15" x 20"
Tractive Effort14990 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.74
Heating Ability
Firebox Area70 sq. ft
Grate Area15.70 sq. ft
Evaporative Heating Surface906 sq. ft
Superheating Surface
Combined Heating Surface906 sq. ft
Evaporative Heating Surface/Cylinder Volume221.48
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2277
Same as above plus superheater percentage2277
Same as above but substitute firebox area for grate area10150
Power L12745
Power MT324.20

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