Snoqualmie Falls Lumber Company 2-8-2 "Mikado" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 11014)

Data from "Logging Locomotives", Record of Recent Construction #96 (Baldwin Locomotive Works, 1918), p. 27-28 and DeGolyer, Vol 52, pp. 368+. Works numbers were 44058 in September 1916 and 44276 in October 1916.

Tips that these were logging engines (other than the name of their owners) were the light axle loading for a Mikado together with specs that included 20-deg curves, 3% grades on the line and 6% on spurs, and rails of no more than 56 lb/yd (28 kg/metre) weight. The road was 8-10 miles (12.8-16.1 km) long and the company, said the specs, "wishes to handle 60 cars per day at a total of three trips, weight of cars loaded is 40 tons." (That is, each trailing load would total 800 tons.)

The design was a standard one. The first two locomotives apparently were scrapped by the SFLC, but the third engine was sold to Weyerhaeuser in 1922.


Class 5 (Locobase 14717)

Data from DeGolyer, Vol 62, pp. 398+. Works number was 52235 in August 1919.

Typical, sizable, oil-burning logging Mikado that ran on 60 lb/yard (30 kg/metre) rail around 30 degree (radii of 193 feet/58.8 metre) curves. The crown sheet was "to be arranged for grades of 7%.)

The 5 didn't remain with was sold to Weyerhaeuser in 1922.

Specifications by Steve Llanso of Sweat House Media
Class15
Locobase ID11,014 14,717
RailroadSnoqualmie Falls Lumber CompanySnoqualmie Falls Lumber Company
CountryUSAUSA
Whyte2-8-22-8-2
Number in Class21
Road Numbers1-25
GaugeStdStd
Number Built21
BuilderBaldwinBaldwin
Year19161919
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.08 / 3.6812.08 / 3.68
Engine Wheelbase (ft / m)27.25 / 8.3128.25 / 8.61
Ratio of driving wheelbase to overall engine wheebase 0.44 0.43
Overall Wheelbase (engine & tender) (ft / m)49.10 / 14.9751.15 / 15.59
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)113,400 / 51,437118,000 / 53,524
Engine Weight (lbs / kg)140,800 / 63,866149,000 / 67,585
Tender Loaded Weight (lbs / kg)70,800 / 32,11470,000 / 31,752
Total Engine and Tender Weight (lbs / kg)211,600 / 95,980219,000 / 99,337
Tender Water Capacity (gals / ML)3500 / 13.263500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)1600 / 6.101600 / 6.10
Minimum weight of rail (calculated) (lb/yd)4749
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 111844 / 1118
Boiler Pressure (psi / kPa)180 / 12.40180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x61019" x 24" / 483x610
Tractive Effort (lbs / kg)27,039 / 12264.7030,127 / 13665.39
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.19 3.92
Heating Ability
Firebox Area (sq ft / m2)140 / 13.01156 / 14.49
Grate Area (sq ft / m2)25.50 / 2.3729 / 2.69
Evaporative Heating Surface (sq ft / m2)2108 / 195.912401 / 223.06
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2108 / 195.912401 / 223.06
Evaporative Heating Surface/Cylinder Volume298.22304.86
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation45905220
Same as above plus superheater percentage45905220
Same as above but substitute firebox area for grate area25,20028,080
Power L152445331
Power MT407.80398.40

Photos