Siler Logging Company 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 15315)

Data from DeGolyer, Volume 73, pp. 343. See also the Works number was 57705 in March 1924.

Siler Logging Company's operation was based at Ames Lake near the town of Carnation, Wash. It was a joint venture between Weyerhaeuser and Port Blakely Mill Company. Open between 1923 and 1931 and supplied timber for railroad grade crossings.

A medium-sized, oil-burning logging Mikado arrived in 1924 to roll on the 25 miles (40.3 km) of 50 lb/yard (25 kg/metre) rail that scaled grades as steep as 3 1/2% and ran around curves as tight as 20 degree (radii of 288 feet/87.8 metres). (Some of the track weighed 45 lb/yard, 22.5 kg/metre.) The route headed roughly due north from Ames Lake to Bromart, which lay just north of Snohomish.

Its piston valves measured 10" (254 mm).

In the early 1930s, the SLC sold out to Weyerhaueser, which renumbered the 3 as their #102.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID15,315
RailroadSiler Logging Company
Number in Class1
Road Numbers3
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.08 / 3.68
Engine Wheelbase (ft / m)28.50 / 8.69
Ratio of driving wheelbase to overall engine wheebase 0.42
Overall Wheelbase (engine & tender) (ft / m)50.35 / 15.35
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)120,000 / 54,431
Engine Weight (lbs / kg)150,000 / 68,039
Tender Loaded Weight (lbs / kg)77,500 / 35,153
Total Engine and Tender Weight (lbs / kg)227,500 / 103,192
Tender Water Capacity (gals / ML)3500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)1700 / 6.40
Minimum weight of rail (calculated) (lb/yd / kg/m)50 / 25
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)19" x 24" / 483x610
Tractive Effort (lbs / kg)30,127 / 13665.39
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.98
Heating Ability
Firebox Area (sq ft / m2)158 / 14.68
Grate Area (sq ft / m2)29 / 2.69
Evaporative Heating Surface (sq ft / m2)1700 / 157.93
Superheating Surface (sq ft / m2)356 / 33.07
Combined Heating Surface (sq ft / m2)2056 / 191
Evaporative Heating Surface/Cylinder Volume215.85
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5220
Same as above plus superheater percentage6107
Same as above but substitute firebox area for grate area33,275
Power L19543
Power MT701.29

All material Copyright ©
Wes Barris