Saginaw Timber 2-8-2 "Mikado" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 2 (Locobase 12765)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 43, p. 234. Works number was 38967 in December 1912.

Placed on the line immediately after Polson Logging engine 101 described in Locobase 12764, this Mikado had a smaller tender, but was otherwise identical. It went to nearby Kerriston, Wash. Its flangeless drivers (on 2nd and 3rd axles) contributed to its being able to negotiate 30-deg curves.

2's subsequent career had several more stops than the 101. It was sold to the NorthWest Lumber Company then in 1929 to Polson. Like the 101, the 2 was kept in service when Rayonier Corporation took over Polson in 1948. In 1963, the 2 moved 2/3s of the way across the country to operate in tourist service on the Grand Travers Northern (Michigan), then on the 4. 1/2 -mile Cadillac & Lake City. Then sold to Kettle Moraine, the 2 eventually was donated to the Illinois Railway Museum.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12765
RailroadSaginaw Timber
Number in Class1
Road Numbers2
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase12.08'
Engine Wheelbase27.25'
Ratio of driving wheelbase to overall engine wheebase 0.44
Overall Wheelbase (engine & tender)50.46'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers113550 lbs
Engine Weight141150 lbs
Tender Light Weight70000 lbs
Total Engine and Tender Weight211150 lbs
Tender Water Capacity3500 gals
Tender Fuel Capacity (oil/coal)1600 gals
Minimum weight of rail (calculated)47 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure180 psi
Cylinders (dia x stroke)18" x 24"
Tractive Effort27039 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.20
Heating Ability
Firebox Area140 sq. ft
Grate Area25.50 sq. ft
Evaporative Heating Surface2108 sq. ft
Superheating Surface
Combined Heating Surface2108 sq. ft
Evaporative Heating Surface/Cylinder Volume298.22
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4590
Same as above plus superheater percentage4590
Same as above but substitute firebox area for grate area25200
Power L15244
Power MT407.26

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