Saginaw Timber 2-8-2 "Mikado" Locomotives in 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
Class2
Locobase ID12,765
RailroadSaginaw Timber
CountryUSA
Whyte2-8-2
Number in Class1
Road Numbers2
GaugeStd
Number Built1
BuilderBaldwin
Year1912
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.08 / 3.68
Engine Wheelbase (ft / m)27.25 / 8.31
Ratio of driving wheelbase to overall engine wheebase 0.44
Overall Wheelbase (engine & tender) (ft / m)50.46 / 15.37
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)113,550 / 51,505
Engine Weight (lbs / kg)141,150 / 64,025
Tender Loaded Weight (lbs / kg)70,000 / 36,287
Total Engine and Tender Weight (lbs / kg)211,150 / 100,312
Tender Water Capacity (gals / ML)3500 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)1600 / 7.60
Minimum weight of rail (calculated) (lb/yd / kg/m)47 / 23.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)27,039 / 12264.70
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.20
Heating Ability
Firebox Area (sq ft / m2)140 / 13.01
Grate Area (sq ft / m2)25.50 / 2.37
Evaporative Heating Surface (sq ft / m2)2108 / 195.91
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2108 / 195.91
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 area25,200
Power L15244
Power MT407.26