Mineral Lake Logging Company 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 103 (Locobase 14143)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 48, p. 243. See also L I Walrath, "Mineral, Washington" in The Coast, Volume 17 (May 1909), pp. 361-362. Works numbers were 39395 in March 1913.

MLLC bought this standard logging Mikado. A 1922 photo shows that the engine was later fitted with a large spark-arresting screened cylinder.

The company's railroad operated in Washington State's Upper Nisqually Valley. After John Donahue built a sawmill in Mineral in 1906, he built a railroad to export the logs he was cutting. Mineral also fast became known as "an ideal spot for a summer resort and is fast becoming noted as one.", according to L I Walrath in 1909. "The altitude is about 1,500, which with surrounding hills and canyons make it very attractive to the tourist. Nestling as it does in the foothills of the Cascade mountains, it certainly rivals many of the beauty spots in foreign lands, to which the ever restless American travels for change and recreation."

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID14143
RailroadMineral Lake Logging Company
Number in Class1
Road Numbers103
Number Built1
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 wheelbase 0.44
Overall Wheelbase (engine & tender) (ft / m)50.46 / 15.38
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)113,500 / 51,483
Engine Weight (lbs / kg)141,100 / 64,002
Tender Loaded Weight (lbs / kg)84,000 / 38,102
Total Engine and Tender Weight (lbs / kg)225,100 / 102,104
Tender Water Capacity (gals / ML)3500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)7 / 6
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)185 / 12.80
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)27,790 / 12605.35
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.08
Heating Ability
Tubes (number - dia) (in / mm)291 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13 / 3.96
Firebox Area (sq ft / m2)140 / 13.01
Grate Area (sq ft / m2)25.50 / 2.37
Evaporative Heating Surface (sq ft / m2)2108 / 195.84
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2108 / 195.84
Evaporative Heating Surface/Cylinder Volume298.16
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4718
Same as above plus superheater percentage4718
Same as above but substitute firebox area for grate area25,900
Power L15388
Power MT418.63

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