Woodward Iron Company 2-6-2 "Prairie" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 22 (Locobase 12698)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 32, p. 271 and Volume 33, p. 26 . Works numbers were 33262 in September 1909 and 34007 in November.

Conceived originally as a high-speed express type, the double-ended Prairie arrangement proved highly useful to logging and industrial service when produced with much smaller drivers. The WIC bought this pair for the latter purpose, accepting a very small grate, and operated them on the 60-lb/yard (30-kg/metre) Woodward Railroad until their scrapping.


Class 23 (Locobase 12697)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 47, p. 222. Works number was 33262 in September 1909.

Locobase wonders if the building date shown in Gene Connelly's comprehensive list of Baldwin production is correct. It seems likely, given the numbering given to this Prairie, which lay between two smaller 2-6-2s produced in September and November 1909; see Locobase 12698.

This engine was larger and showed a better balance between grate and boiler. Like the other Prairies, the 23 operated on the Woodward Railroad until its scrapping in 1946.

Specifications by Steve Llanso of Sweat House Media
Class2223
Locobase ID12,698 12,697
RailroadWoodward Iron CompanyWoodward Iron Company
CountryUSAUSA
Whyte2-6-22-6-2
Number in Class21
Road Numbers22, 2423
GaugeStdStd
Number Built21
BuilderBaldwinBaldwin
Year19091909
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 9.1712
Engine Wheelbase (ft)24.6728
Ratio of driving wheelbase to overall engine wheebase 0.37 0.43
Overall Wheelbase (engine & tender) (ft)4656.37
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)82,000113,000
Engine Weight (lbs)111,000164,000
Tender Loaded Weight (lbs)60,0006000
Total Engine and Tender Weight (lbs)171,000170,000
Tender Water Capacity (gals)3000
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)4663
Geometry Relating to Tractive Effort
Driver Diameter (in)4455
Boiler Pressure (psi)180180
High Pressure Cylinders (dia x stroke) (in)16" x 24"22" x 28"
Tractive Effort (lbs)21,36437,699
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.84 3.00
Heating Ability
Firebox Area (sq ft)118145.30
Grate Area (sq ft)1642.50
Evaporative Heating Surface (sq ft)16002713
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)16002713
Evaporative Heating Surface/Cylinder Volume286.48220.23
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation28807650
Same as above plus superheater percentage28807650
Same as above but substitute firebox area for grate area21,24026,154
Power L151764607
Power MT417.48269.65