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

Class Details by Steve Llanso of Sweat House Media

Class 32 (Locobase 12724)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 27, p. 148. Works numbers were 24790, 24819 in November 1904 and 31126, 31161 in June 1907.

A 1928 photograph from Mike Condren's website -- http://condrenrails.com/FSVB/Midland%20Valley/30-class-4-4-0.htm -- shows that the 33 at least had been refitted with Southern valve gear. The tender also shows that the Kansas, Oklahoma & Gulf later operated the MV.

A sixth locomotive was sold to the Atlanta, Birmingham & Atlantic; see Locobase 13255.

Class 61 (Locobase 13941)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 43, p. 104. See also KO&G 8 -1918 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. (Thanks to Chris Hohl for his 15 March 2015 email noting the larger tender capacity and inspiring a longer note on the subject in this entry.) 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. Works numbers were 33558-33559 in July 1909, 33821 in September.

Using the same boiler as the earlier Midland Valley engines (Locobase 12724), the nearby MO&G specified greater cylinder stroke, but lower boiler pressure. The Baldwin spec calls for a "long and low" tender with "trucks well spaced." The tender's water capacity shown is as specified in 1909; the spec doesn't give the fuel capacity.

Hohl called Locobase's attention to the 1918 diagram, which reflects a likely conclusion by the KO&G that they needed to trail more water and fuel capacity. The diagrams show that each of the three Eight-wheelers had a different tender. In the 61 and 63, water capacity rose by only 11% to 5,000 gallons (18,925 litres) while 65's tender increased water capacity by a third to 6,000 gallons (22,710 litres) . All three tenders held 7 tons (6.35 metric tons) of coal, which Locobase supposes was the original capacity.

Each tender had a different wheel base and overall length:

Engine number wheelbase overall length

61 14' 11" (4.55 m) 25' 1 1/2" (7.66 m)

63 16' 5" (5.00 m) 26' 7" (8.10 m)

65 14' 7" (4.44 m) 24' 8" (7.52 m)

Specifications by Steve Llanso of Sweat House Media
Locobase ID12724 13941
RailroadMidland Valley (KO&G)Missouri, Oklahoma & Gulf (KO&G)
Number in Class43
Road Numbers32-3561, 63, 65
Number Built43
BuilderBurnham, Williams & CoBaldwin
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase 9.08' 9.08'
Engine Wheelbase23.92'23.92'
Ratio of driving wheelbase to overall engine wheebase 0.38 0.38
Overall Wheelbase (engine & tender)46.50'49.37'
Axle Loading (Maximum Weight per Axle)37600 lbs
Weight on Drivers73000 lbs74700 lbs
Engine Weight115000 lbs117100 lbs
Tender Light Weight85000 lbs90000 lbs
Total Engine and Tender Weight200000 lbs207100 lbs
Tender Water Capacity4000 gals4500 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)61 lb/yard62 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"63"
Boiler Pressure180 psi165 psi
Cylinders (dia x stroke)18" x 24"18" x 26"
Tractive Effort18885 lbs18753 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.87 3.98
Heating Ability
Firebox Area148.80 sq. ft148.40 sq. ft
Grate Area18.50 sq. ft18.50 sq. ft
Evaporative Heating Surface1643 sq. ft1643 sq. ft
Superheating Surface
Combined Heating Surface1643 sq. ft1643 sq. ft
Evaporative Heating Surface/Cylinder Volume232.44214.56
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation33303053
Same as above plus superheater percentage33303053
Same as above but substitute firebox area for grate area2678424486
Power L163825396
Power MT385.48318.50


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