Deep River Logging Company / Deep River Lumber Corporation 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 14700)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 62, p. 329. Works number was 51822 in May 1919.

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.

Class 7 (Locobase 14303)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 52, pp. 338. Works number was 42199 in July 1915.

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
Locobase ID14700 14303
RailroadDeep River Lumber CorporationDeep River Logging Company
Number in Class11
Road Numbers47
Number Built11
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase 7.83' 9.17'
Engine Wheelbase20.58'24.67'
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 Drivers40000 lbs86000 lbs
Engine Weight55000 lbs111000 lbs
Tender Light Weight45000 lbs50500 lbs
Total Engine and Tender Weight100000 lbs161500 lbs
Tender Water Capacity2000 gals2500 gals
Tender Fuel Capacity (oil/coal)1200 gals
Minimum weight of rail (calculated)22 lb/yard48 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter36"44"
Boiler Pressure180 psi180 psi
Cylinders (dia x stroke)12" x 16"16" x 24"
Tractive Effort9792 lbs21364 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.08 4.03
Heating Ability
Firebox Area53 sq. ft118 sq. ft
Grate Area14 sq. ft16 sq. ft
Evaporative Heating Surface430 sq. ft1600 sq. ft
Superheating Surface
Combined Heating Surface430 sq. ft1600 sq. ft
Evaporative Heating Surface/Cylinder Volume205.31286.48
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation25202880
Same as above plus superheater percentage25202880
Same as above but substitute firebox area for grate area954021240
Power L135845176
Power MT592.60398.06

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