Clover Valley Lumber 2-6-6-2 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 4053)

Data from, supplemented by DeGolyer, Vol 73, pp. 247+. See also C R Heimerdinger, "California's Baldwin Logging Mallets", Pacific News (March 1979) archived by at . Works number was 57684 in March 1924.

Like many of the logging locomotives supplied by Baldwin, this engine had split saddletanks on the boiler (one over each engine unit), which shortened the engine's wheelbase. In fact, this was the very first of the type to be delivered. The superheated boiler's steam was admitted through 8" (203 mm) piston valves to the HP cylinders and 12" (305 mm) piston valves to the larger LP cylinders.

This engine stayed with Clover Valley at Loyalton, Calif until 1956, when the Feather River Lumber Company took over the road and operated #4 for two more years before she went into semi-retirement as a stationary boiler for the Tahoe Timber Company. She ran on the Castro Point Railway in California for 7 years (1979-1986), after which she was stored in Fremont, CA.

Specifications by Steve Llanso of Sweat House Media
Locobase ID4053
RailroadClover Valley Lumber
Number in Class1
Road Numbers4
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase8'
Engine Wheelbase37.75'
Ratio of driving wheelbase to overall engine wheebase 0.21
Overall Wheelbase (engine & tender)37.75'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers182000 lbs
Engine Weight219000 lbs
Tender Light Weight
Total Engine and Tender Weight219000 lbs
Tender Water Capacity2500 gals
Tender Fuel Capacity (oil/coal)1200 gals
Minimum weight of rail (calculated)51 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter45"
Boiler Pressure200 psi
High Pressure Cylinders (dia x stroke)17" x 24"
Low Pressure Cylinders (dia x stroke)26" x 24" (2)
Tractive Effort36711 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.96
Heating Ability
Firebox Area128 sq. ft
Grate Area26.20 sq. ft
Evaporative Heating Surface1654 sq. ft
Superheating Surface358 sq. ft
Combined Heating Surface2012 sq. ft
Evaporative Heating Surface/Cylinder Volume262.33
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5240
Same as above plus superheater percentage6183
Same as above but substitute firebox area for grate area30208
Power L15610
Power MT407.73

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