Osage Railway 2-10-0 "Decapod" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 10 (Locobase 6781)

Data from 1944 KO & G Locomotive Diagrams book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 74, pp. 32+. (Thanks to Chris Hohl for his April 2015 email supplying the tender capacity.) Works number 58403 in May 1925.

Relatively small decapod with 12" (206 mm) piston valves that was an "only" for the Osage in Oklahoma. This railway was built in the early 1920s to support oil traffic from fields in the Osage Indian Nation and remained independent until its closure in 1953.

The design's construction details were to be as much as possible the same as for the two Midland Valley 2-8-2s (Locobase 15332) produced in the same year. Firebox heating surface area included 25 sq ft (2.3 sq m) of arch tubes.

The 10 didn't remain on the Osage for very long. It soon moved over to the Kansas, Oklahoma & Gulf, where it spent most of its working life. The KO&G acquired the engine in 1929 in a trade for the KO&G's 2-8-0 #235, which Mike Condren notes "was much better suited for the Osage Railway"

See Locobases 1396-1397 for a description of this stock Baldwin light decapod bought by several railroads in the 1920s. Their experience with the light-footed Russian decapods prompted the surge in interest in the arrangement.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID6781
RailroadOsage Railway
Number in Class1
Road Numbers10 / 110
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)20 / 6.10
Engine Wheelbase (ft / m)28.67 / 8.74
Ratio of driving wheelbase to overall engine wheebase 0.70
Overall Wheelbase (engine & tender) (ft / m)64 / 19.51
Axle Loading (Maximum Weight per Axle) (lbs / kg)38,000 / 17,237
Weight on Drivers (lbs / kg)190,000 / 86,183
Engine Weight (lbs / kg)212,000 / 96,162
Tender Loaded Weight (lbs / kg)161,000 / 73,028
Total Engine and Tender Weight (lbs / kg)373,000 / 169,190
Tender Water Capacity (gals / ML)8000
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)14
Minimum weight of rail (calculated) (lb/yd / kg/m)63 / 31.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56 / 1422
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)24" x 28" / 610x711
Tractive Effort (lbs / kg)48,960 / 22207.91
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.88
Heating Ability
Firebox Area (sq ft / m2)197 / 18.30
Grate Area (sq ft / m2)54.30 / 5.04
Evaporative Heating Surface (sq ft / m2)2343 / 217.67
Superheating Surface (sq ft / m2)553 / 51.37
Combined Heating Surface (sq ft / m2)2896 / 269.04
Evaporative Heating Surface/Cylinder Volume159.81
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,860
Same as above plus superheater percentage12,923
Same as above but substitute firebox area for grate area46,886
Power L110,574
Power MT613.46

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