Smith-Powers Logging Company 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 101 (Locobase 13906)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 48, p. 239 and 241. Works numbers were 38271 in September 1912, 38965 in December, and 39698 in April 1913.

C A Smith Lumber and Manufacturing Company was based in Oregon and like many other logging companies of the time found that their profile and traffic levels overmatched the traditional 6-coupled engines (2-6-2 or 4-6-0, for example). The trio of 2-8-2s shown in this entry followed a Baldwin design already in use by several companies.

The working conditions weren't as onerous as many other timber venues: Maximum grade reached 2%, the sharpest curves bent at only 11 degrees (521-ft/159-m radius), and the rails weighed 60 lb/yard (30 kg/metre), a relatively hefty figure. 101 used soft coal while 102 burned the lower-calorie lignite. A note in 103's spec shows that the grate bars and fingers had 5/8" (15.9 mm) openings to hold the finer lumps of coal.

Smith-Powers was renamed Coos Bay Lumber Company in 1921. In 1926, 101 went to work for Puget Sound Pulp. It was scrapped at Mt Vernon, Wash. in 1941. 102, on the other hand, remained with Coos Bay until 1942, when it was drafted by the US Army and given road number 6813.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID13906
RailroadSmith-Powers Logging Company
Number in Class3
Road Numbers101-103
Number Built3
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)49.96 / 15.23
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)113,500 / 50,349
Engine Weight (lbs / kg)141,100 / 63,049
Tender Loaded Weight (lbs / kg)84,000 / 31,752
Total Engine and Tender Weight (lbs / kg)225,100 / 94,801
Tender Water Capacity (gals / ML)4200 / 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 / 12.40
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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