Thurston County 2-8-2 "Mikado" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 14126)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 43, p. 228. Works number was 38836 in November 1912.

This Mikado was bought by the Mud Bay Logging Company of Olympia, Wash for the TCRwy. Special instructions in the specifications included the requirement that the steam dome be made higher than on other Baldwin logging Mikados in Washington State (Peninsular 109 and Twin Falls 102) so that dry steam would be "assured" on 6% grades.

Specifications by Steve Llanso of Sweat House Media
Class4
Locobase ID14,126
RailroadThurston County
CountryUSA
Whyte2-8-2
Number in Class1
Road Numbers4
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)56.85 / 17.33
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)113,400 / 51,437
Engine Weight (lbs / kg)141,100 / 64,002
Tender Loaded Weight (lbs / kg)60,000 / 27,216
Total Engine and Tender Weight (lbs / kg)201,100 / 91,218
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)1400 / 5.30
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) 4.19
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 / 195.84
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2108 / 195.84
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 MT407.80