Very small wood-burning logging Prairie suitable for the light (30 lb/yard, 15 kg/metre) rail of a South Carolina lumber company's tram line. The small scale is indicated by its total length of 15 miles (24.1 km).
The 4 would later work for the Beaufort County Lumber Company in North Carolina.
This Washington State logging company had its headquarters in Wahkiakum County. Its profile included maximum grades of 4% (partially compensated for curves) and average grades of 1 1/2-2%. Curves measured as tight as 25 degrees (207 foot/63 metre radii), and rails weighed 56 lb/yard.
Other than the use of oil fuel, this engine was typical of a medium-sized logging Prairie.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Deep River Lumber Corporation||Deep River Logging Company|
|Number in Class||1||1|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.38||0.37|
|Overall Wheelbase (engine & tender)||39.77'||46.75'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||40000 lbs||86000 lbs|
|Engine Weight||55000 lbs||111000 lbs|
|Tender Light Weight||45000 lbs||50500 lbs|
|Total Engine and Tender Weight||100000 lbs||161500 lbs|
|Tender Water Capacity||2000 gals||2500 gals|
|Tender Fuel Capacity (oil/coal)||1200 gals|
|Minimum weight of rail (calculated)||22 lb/yard||48 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||180 psi||180 psi|
|Cylinders (dia x stroke)||12" x 16"||16" x 24"|
|Tractive Effort||9792 lbs||21364 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.08||4.03|
|Firebox Area||53 sq. ft||118 sq. ft|
|Grate Area||14 sq. ft||16 sq. ft|
|Evaporative Heating Surface||430 sq. ft||1600 sq. ft|
|Combined Heating Surface||430 sq. ft||1600 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||205.31||286.48|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||2520||2880|
|Same as above plus superheater percentage||2520||2880|
|Same as above but substitute firebox area for grate area||9540||21240|