Silver Lake Railway & Lumber Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 2 (Locobase 13822)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 39, p. 61. See Locobase 13471 for a biography of E S Collins. Works number was 37565 in March 1912.

This was another arrow in the quiver of lumberman E S Collins as he exploited the timber stands of Cowlitz County, Washington State. The SLR&LC was established in 1903. It featured light rail -- 35-40 lb/yard (15.5-20 kg/metre) -- and maximum grades of 5%. The front tank corners were cut off "8 inches deep and 60 inches long giving better view for engine men." The specs also mention an enlarged tank equalizing pipe (5/127 mm in diameter).

(See Locobase 4984 for an account of how these pipes might cause a locomotive to roll over while at rest. The engine in question was the Baldwin-built 4-6-0T used on the British War Department Light Railways.)

The company wasn't always seen as the benevolent provider of jobs and profits shown in much of the literature. [] shows the Spokane, Washington Evening Chronicle's 9 April 1910 story (p. 26) on a "land grab" perpetrated by the SLR&LC in 1906.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID13,822
RailroadSilver Lake Railway & Lumber Company
Number in Class1
Road Numbers2
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.50 / 2.90
Engine Wheelbase (ft / m)21.92 / 6.68
Ratio of driving wheelbase to overall engine wheebase 0.43
Overall Wheelbase (engine & tender) (ft / m)21.92 / 6.68
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)60,000 / 27,216
Engine Weight (lbs / kg)84,000 / 38,102
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)84,000
Tender Water Capacity (gals / ML)1000 / 3.79
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)33 / 16.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)37 / 940
Boiler Pressure (psi / kPa)175 / 12.10
High Pressure Cylinders (dia x stroke) (in / mm)13.5" x 18" / 343x457
Tractive Effort (lbs / kg)13,188 / 5981.98
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.55
Heating Ability
Firebox Area (sq ft / m2)71 / 6.60
Grate Area (sq ft / m2)12.50 / 1.16
Evaporative Heating Surface (sq ft / m2)654 / 60.76
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)654 / 60.76
Evaporative Heating Surface/Cylinder Volume219.31
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2188
Same as above plus superheater percentage2188
Same as above but substitute firebox area for grate area12,425
Power L13651
Power MT402.45

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Wes Barris