Clemons Logging Co 2-6-6-2 Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 6 (Locobase 4052)

Data from http://loggingmallets.railfan.net, supplemented by DeGolyer, Vol 71, pp. 226+. See also Clark Kinsey photograph and text at University of Washington Libraries, Special Collections at http://content.lib.washington.edu/cdm4/item_viewer.php?CISOROOT=/clarkkinsey&CISOPTR=73, last accessed 3 July 2012. Works number was 57601 in January 1924.

Baldwin's mid-1920s offering of an articulated tank with six coupled axles in two groups proved to be a satisfactory combination of power and flexibility for a series of Northwest timber harvesters. Rails weighed a relatively light 60 lb/yard (30 kg/metre), maximum grades often exceeded 4%, and curves could be as tight as 40 degrees.

The basic layout came in several versions that differed in the kinds of water tanks (Clemons #6 had rectangular side tanks), cylinder volumes, and weight.) Like the other Baldwin 2-6-6-2 tanks, the HP cylinders in 7 and 8 used 8" (203 mm) piston valves and LP cylinders were served by 12" (305 mm) piston valves.

The website's photo of #6 is accompanied by a summary of the company's history: "Clemons Logging Company was organized in 1903 ... In 1919, the company was consolidated with the Melbourne and North River Railroad Company, an eight mile logging railroad extending from Melbourne to Montesano. In that same year, the company was reorganized as the Clemons Logging Company, a wholly owned subsidiary of the Weyerhaeuser Timber Company."

Eventually, CLC would run trains over 75 miles (120 km) of logging road. Not quite two decades later, CLC was dissolved on 29 June 1937 as a result of its assets being taken into the parent company.

Clemons would return to Baldwin for a slightly bigger pair of engines in 1925; see Locobase 4051. 6 remained with Weyerhaeuser into the 1950s.


Class 7 (Locobase 4051)

Data from http://loggingmallets.railfan.net, supplemented by DeGolyer, Vol 80, pp. 286+. See Locobase 3643 for a discussion of the split-saddletank design. Works numbers were 58529 in July 1925 and 60343 in January 1928.

Very similar to the Weyerhaeuser Prairie Mallet tanks, these two were delivered to Clemons in 1925 and 1928. Like the Weyerhaeuser, this design featured split saddletanks on the boiler (one over each engine unit), which shortened the engine's wheelbase. Its HP cylinders were served by 8" (203 mm) piston valves, LPs by 12" (305 mm) piston valves. The 7 and 8 rolled on 60 lb/yard (30 kg/ metre) rails and were confronted with 4% adverse grades in the empty (i.e. back to the forest) direction while loaded cars faced only a 1% grade.

Specifications by Steve Llanso of Sweat House Media
Class67
Locobase ID4052 4051
RailroadClemons Logging CoClemons Logging Co
CountryUSAUSA
Whyte2-6-6-2T2-6-6-2T
Number in Class12
Road Numbers67-8
GaugeStdStd
Number Built12
BuilderBaldwinBaldwin
Year19241925
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase8'8'
Engine Wheelbase37.75'37.75'
Ratio of driving wheelbase to overall engine wheebase 0.21 0.21
Overall Wheelbase (engine & tender)37.75'37.75'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers182000 lbs200000 lbs
Engine Weight220000 lbs238000 lbs
Tender Light Weight
Total Engine and Tender Weight220000 lbs238000 lbs
Tender Water Capacity2500 gals2500 gals
Tender Fuel Capacity (oil/coal)1000 gals1000 gals
Minimum weight of rail (calculated)51 lb/yard56 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"44"
Boiler Pressure200 psi200 psi
High Pressure Cylinders (dia x stroke)17" x 24"18" x 24"
Low Pressure Cylinders (dia x stroke)26" x 24" (2)28" x 24" (2)
Tractive Effort37545 lbs42517 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.85 4.70
Heating Ability
Firebox Area128 sq. ft128 sq. ft
Grate Area26.20 sq. ft26.20 sq. ft
Evaporative Heating Surface1654 sq. ft1654 sq. ft
Superheating Surface358 sq. ft358 sq. ft
Combined Heating Surface2012 sq. ft2012 sq. ft
Evaporative Heating Surface/Cylinder Volume262.33233.99
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation52405240
Same as above plus superheater percentage61836183
Same as above but substitute firebox area for grate area3020830208
Power L154864730
Power MT398.72312.84


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