Pacific States Lumber Company 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 9 (Locobase 15233)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 71, pp. 341+. Works number was 55480 in June 1922.

Pacific States opened its Kangley, Wash sawmill in 1910 and started cutting timber at the rate of 125,000 feet per day. In 1922, when PSL ordered the logging Mikado they numbered 9, the railroad featured 60 lb/yard (30 kg/metre) rail arcing around relatively gentle 11 degree (radii of 521 ft/159 m) curves and climbing ruling grades of 2%. This engine had 8" (203 mm) piston valves.

According to Gene Connelly's Baldwin production list, the railroad closed in 1939 and the 9 moved on to operate on PSL's Cascade Timber Company railroad.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID15,233
RailroadPacific States Lumber Company
Number in Class1
Road Numbers9
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)27.58 / 8.41
Ratio of driving wheelbase to overall engine wheebase 0.44
Overall Wheelbase (engine & tender) (ft / m)50.79 / 15.48
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)118,000 / 53,524
Engine Weight (lbs / kg)144,000 / 65,317
Tender Loaded Weight (lbs / kg)84,000 / 38,102
Total Engine and Tender Weight (lbs / kg)228,000 / 103,419
Tender Water Capacity (gals / ML)3500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)7 / 6.40
Minimum weight of rail (calculated) (lb/yd / kg/m)49 / 24.50
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) 4.25
Heating Ability
Firebox Area (sq ft / m2)141 / 13.10
Grate Area (sq ft / m2)25.50 / 2.37
Evaporative Heating Surface (sq ft / m2)1576 / 146.41
Superheating Surface (sq ft / m2)328 / 30.47
Combined Heating Surface (sq ft / m2)1904 / 176.88
Evaporative Heating Surface/Cylinder Volume222.96
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4718
Same as above plus superheater percentage5519
Same as above but substitute firebox area for grate area30,519
Power L110,044
Power MT750.62

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