Ozan-Graysonia Lumber Company 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class George Teat (Locobase 11013)

Data from "Logging Locomotives", Record of Recent Construction #96 (Baldwin Locomotive Works, 1918), p. 22-23. See also DeGolyer, Volume 62, pp. 375. (Thanks to Chris Hohl for his 29 November 2015 email correcting the tender capacities and loaded weight.) Works number was 51771 in May 1919.

This logging Prairie used the same boiler and firebox as the Leesville, Slagle & Eastern locomotive shown in Locobase 11012. Increasing the driver diameter (presumably to allow it to operate as a mixed-traffic locomotive) required an increase in boiler pressure to maintain the same level of tractive effort. It had the big, spark-arresting stack used by many of the loggers, but unusually, steam was admitted to the cylinders through 9 1/2" (241 mm) piston valves. The tender's coal capacity was described in the Baldwin specs as "6 to 7 tons".

Since the Baldwin Record attributes the George Teat's ownership to the O-G RR from the start, Connelly's reference to the Caddo River Lumber #9 is a little confusing. In any case, the next change was the sale by the O-G in 1938 to the Prescott & Northwestern, who later sold it to Higgins Shipbuilding Company as their #7. Higgins sold #7 after the war to the Black Hill Central in South Dakota.

Specifications by Steve Llanso of Sweat House Media
ClassGeorge Teat
Locobase ID11013
RailroadOzan-Graysonia Lumber Company
Number in Class2
Road Numbers2
Number Built2
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase10.25'
Engine Wheelbase26.83'
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender)50.69'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers96000 lbs
Engine Weight125000 lbs
Tender Light Weight80000 lbs
Total Engine and Tender Weight205000 lbs
Tender Water Capacity4000 gals
Tender Fuel Capacity (oil/coal)6 tons
Minimum weight of rail (calculated)53 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter46"
Boiler Pressure180 psi
Cylinders (dia x stroke)17" x 24"
Tractive Effort23070 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.16
Heating Ability
Firebox Area101 sq. ft
Grate Area18.70 sq. ft
Evaporative Heating Surface1637 sq. ft
Superheating Surface
Combined Heating Surface1637 sq. ft
Evaporative Heating Surface/Cylinder Volume259.64
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3366
Same as above plus superheater percentage3366
Same as above but substitute firebox area for grate area18180
Power L14688
Power MT322.98

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