Ozan-Graysonia Lumber Company 2-6-2 "Prairie" Locomotives in 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.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassGeorge Teat
Locobase ID11,013
RailroadOzan-Graysonia Lumber Company
CountryUSA
Whyte2-6-2
Number in Class2
Road Numbers2
GaugeStd
Number Built2
BuilderBaldwin
Year1919
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.25 / 3.12
Engine Wheelbase (ft / m)26.83 / 8.18
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender) (ft / m)50.69 / 15.45
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)96,000 / 43,545
Engine Weight (lbs / kg)125,000 / 56,699
Tender Loaded Weight (lbs / kg)80,000 / 36,287
Total Engine and Tender Weight (lbs / kg)205,000 / 92,986
Tender Water Capacity (gals / ML)4000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)6 / 5.50
Minimum weight of rail (calculated) (lb/yd / kg/m)53 / 26.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)46 / 1168
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)23,070 / 10464.39
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.16
Heating Ability
Firebox Area (sq ft / m2)101 / 9.38
Grate Area (sq ft / m2)18.70 / 1.74
Evaporative Heating Surface (sq ft / m2)1637 / 152.08
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1637 / 152.08
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 area18,180
Power L14688
Power MT322.98

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