A S Johnson Lumber Company 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 9 (Locobase 11728)

Data from Negative 8871, Southern Methodist University, Central University Libraries, DeGolyer Library collection of digitized Baldwin images, retrieved 26 October 2010 from http://digitalcollections.smu.edu/cdm4/item_viewer.php . See also DeGolyer Baldwin Specifications, Vol 71, pp. 269. Works number was 56767 in July 1923.

One of the smaller logging Prairies to run on the standard gauge. This oil-burner's mid-20s building date shows that certain applications--such as logging--resisted motor trucks more easily than others. It was specified to be easily convertible to burning coal fuel.

At some later date, ASJ sold the 9 to Mansfield Hardwood Lumber Company of Winnifield, La.

Specifications by Steve Llanso of Sweat House Media
Locobase ID11728
RailroadA S Johnson Lumber Company
Number in Class1
Road Numbers9
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase8'
Engine Wheelbase22'
Ratio of driving wheelbase to overall engine wheebase 0.36
Overall Wheelbase (engine & tender)46.23'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers58220 lbs
Engine Weight79360 lbs
Tender Light Weight69640 lbs
Total Engine and Tender Weight149000 lbs
Tender Water Capacity3000 gals
Tender Fuel Capacity (oil/coal)1500 gals
Minimum weight of rail (calculated)32 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter42"
Boiler Pressure180 psi
Cylinders (dia x stroke)13" x 22"
Tractive Effort13544 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.30
Heating Ability
Firebox Area74 sq. ft
Grate Area13.30 sq. ft
Evaporative Heating Surface767 sq. ft
Superheating Surface
Combined Heating Surface767 sq. ft
Evaporative Heating Surface/Cylinder Volume226.94
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2394
Same as above plus superheater percentage2394
Same as above but substitute firebox area for grate area13320
Power L14239
Power MT481.56

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