This Prairie logger was originally ordered by South Carolina's Sumter Logging as their #2, but was relettered and renumbered for the RCBH & W before its delivery. The RCBH & W originally was chartered in 1891 as the Dakota, Wyoming & Missouri River Railroad Company. Reorganized twice in 1904, ultimately as the Missouri River & North Western Railway Company, the road was sold at foreclosure in 1909 and reorganized as Rapid City, Black Hills & Western Railroad Company.
At the time of the 1909 sale, the Crouch Line (after founder Charles D Crouch) measured 32.8 miles as it wended its way through the Rapid Canyon from Rapid City to Mystic. John Hafner's Black Hills Believables: Strange-but-true Tales of the Old West (Fort Collins, CO: Lone Pine Productions, 2002) p. 26, claims that the route made 14 complete circles within the distance and was the crookedest railroad ever built.
(Gene Connelly's Baldwin file puts the transfer in 1919. Connelly also reports that the 48 was destroyed in a 1928 roundhouse fire.)
Four years after the RCBH & W bought its first logging Prairie from Baldwin, it returned for a similar engine. The only significant difference was the 12% increase in boiler pressure and a commensurate increase in adhesion weight and engine weight. Even with the weight increase, these were theoretically pretty slippery engines.
The 49 remained on the railroad for its entire career. It was scrapped in 1939.
With the 51, the RCBH & W addressed the factor-of-adhesion problem apparent in the 49 (Locobase 13824) by increasing the size of the boiler, raising the cylinder volume, slightly decreasing the boiler, and adding 9 1/2 tons to the weight pressing on the drivers. The result was a balanced, powerful logging Prairie. The Baldwin oil burner was placed in the front of the firebox.
51's career was cut short by the same 1928 roundhouse fire that totalled the 48 (Locobase 13711).
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Rapid City, Black Hills & Western||Rapid City, Black Hills & Western||Rapid City, Black Hills & Western|
|Number in Class||1||1||1|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.39||0.39||0.37|
|Overall Wheelbase (engine & tender)||45.73'||47.15'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||65000 lbs||69000 lbs||84000 lbs|
|Engine Weight||90000 lbs||93000 lbs||111000 lbs|
|Tender Light Weight||60000 lbs||60000 lbs||80000 lbs|
|Total Engine and Tender Weight||150000 lbs||153000 lbs||191000 lbs|
|Tender Water Capacity||3000 gals||3000 gals||4000 gals|
|Tender Fuel Capacity (oil/coal)||1500 gals||1800 gals|
|Minimum weight of rail (calculated)||36 lb/yard||38 lb/yard||47 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||160 psi||180 psi||175 psi|
|Cylinders (dia x stroke)||15" x 24"||15" x 24"||16" x 24"|
|Tractive Effort||16691 lbs||18777 lbs||20771 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||3.89||3.67||4.04|
|Firebox Area||86 sq. ft||86 sq. ft||109 sq. ft|
|Grate Area||14.10 sq. ft||14.10 sq. ft||15.60 sq. ft|
|Evaporative Heating Surface||1074 sq. ft||1074 sq. ft||1319 sq. ft|
|Combined Heating Surface||1074 sq. ft||1074 sq. ft||1319 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||218.79||218.79||236.17|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||2256||2538||2730|
|Same as above plus superheater percentage||2256||2538||2730|
|Same as above but substitute firebox area for grate area||13760||15480||19075|