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

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Class Details by Steve Llanso of Sweat House Media

Class 2 (Locobase 14716)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 62, p. 395. Works number was 53146 in April 1920.

A small Mikado tank traveled over this peninsular logging railway on 40-45 lb/yard (20-22.5 kg/metre) rail up 4 and 5% grades, and curves "not over" 25 degrees (radii of 231 feet/70.4 metres).

The 2 would later work on the Weyerhaeuser Timber Company.


Class 3 (Locobase 15315)

Data from DeGolyer, Vol 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.

Specifications by Steve Llanso of Sweat House Media
Class23
Locobase ID14,716 15,315
RailroadSimpson Logging CompanySiler Logging Company
CountryUSAUSA
Whyte2-8-2ST2-8-2
Number in Class11
Road Numbers23
GaugeStdStd
Number Built11
BuilderBaldwinBaldwin
Year19201924
Valve GearStephensonWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.50 / 3.5112.08 / 3.68
Engine Wheelbase (ft / m)25.75 / 7.8528.50 / 8.69
Ratio of driving wheelbase to overall engine wheebase 0.45 0.42
Overall Wheelbase (engine & tender) (ft / m)5 / 1.5250.35 / 15.35
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)95,500 / 43,318120,000 / 54,431
Engine Weight (lbs / kg)124,500 / 56,472150,000 / 68,039
Tender Loaded Weight (lbs / kg)77,500 / 35,153
Total Engine and Tender Weight (lbs / kg)124,500227,500 / 103,192
Tender Water Capacity (gals / ML)1700 / 6.443500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)650 / 2.501700 / 6.40
Minimum weight of rail (calculated) (lb/yd / kg/m)40 / 2050 / 25
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)41 / 104144 / 1118
Boiler Pressure (psi / kPa)180 / 12.40180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)16" x 22" / 406x55919" x 24" / 483x610
Tractive Effort (lbs / kg)21,017 / 9533.1630,127 / 13665.39
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.54 3.98
Heating Ability
Firebox Area (sq ft / m2)78 / 7.25158 / 14.68
Grate Area (sq ft / m2)17.70 / 1.6429 / 2.69
Evaporative Heating Surface (sq ft / m2)1018 / 94.571700 / 157.93
Superheating Surface (sq ft / m2)356 / 33.07
Combined Heating Surface (sq ft / m2)1018 / 94.572056 / 191
Evaporative Heating Surface/Cylinder Volume198.84215.85
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation31865220
Same as above plus superheater percentage31866107
Same as above but substitute firebox area for grate area14,04033,275
Power L133839543
Power MT312.39701.29