Midland Valley / Missouri, Oklahoma & Gulf 4-6-0 "Ten-wheeler" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 101 (Locobase 13230)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 31, p. 103, Volume 32, p. 1. Works numbers were 32284 in November 1907, 32345-32346 in December, 33043 in November 1908, and 33387-33388 in April 1909. A summary of the Muskogee Company empire appears in the Muskogee Company records, DeGolyer Library, Southern Methodist University, http://www.lib.utexas.edu/taro/smu/00131/smu-00131.html, last accessed 26 April 2015.

The MO&G was chartered in 1904 and built 102 mainline miles of 70-lb/yard (35-kg/metre) railway from Wagoner to Red River and another 114 miles in branches and spurs. The affiliated MO&G Railway of Texas built a continuation from Red River to Denison, Tex beginning in 1910. See Locobase 17 for a Handbook of Texas description of the KOG. (http://www.tsha.utexas.edu/handbook/online/articles/view/KK/eqk6.html -- the Handbook of Texas Online).

Locobase wonders at the persistence of this prairie railroad's preference for such a small grate on this design. Granted, the cylinder volume was easily served by the relatively large boiler and firebox heating surface area wasn't less than average. And its power certainly was up to the task.

Whatever its limitations, the light Ten-wheeler sextet served the MO&G and its February 1920 successor Kansas, Oklahoma & Gulf for years. 101 later was sold to Finkbine Lumber and renumbered

Class 20 (Locobase 12859)

Data from Baldwin Locomotive Works Specification for Engines, 1903, as digitized by the DeGolyer Library of Southern Methodist University, Volume 28, p. 163. Works numbers were 26408-26409, 26469, 26477 in September 1909; 29525 in November

Specifications by Steve Llanso of Sweat House Media
Locobase ID13,230 12,859
RailroadMissouri, Oklahoma & Gulf (KO&G)Midland Valley (KO&G)
Number in Class65
Road Numbers101-10620-24 / 50-54
Number Built65
BuilderBurnham, Williams & CoBurnham, Williams & Co
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)14.2511.33
Engine Wheelbase (ft)24.9221.58
Ratio of driving wheelbase to overall engine wheebase 0.57 0.53
Overall Wheelbase (engine & tender) (ft)
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)88,000
Engine Weight (lbs)120,000
Tender Loaded Weight (lbs)80,000100,000
Total Engine and Tender Weight (lbs)200,000
Tender Water Capacity (gals)40005000
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)49
Geometry Relating to Tractive Effort
Driver Diameter (in)5257
Boiler Pressure (psi)180190
High Pressure Cylinders (dia x stroke) (in)18" x 24"18" x 24"
Tractive Effort (lbs)22,87922,032
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.85
Heating Ability
Firebox Area (sq ft)144145
Grate Area (sq ft)17.3022.20
Evaporative Heating Surface (sq ft)17881796
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)17881796
Evaporative Heating Surface/Cylinder Volume252.95254.08
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation31144218
Same as above plus superheater percentage31144218
Same as above but substitute firebox area for grate area25,92027,550
Power L155356438
Power MT416.00


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