South Western of Arizona 2-8-0 "Consolidation" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 2 (Locobase 12522)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 24, p. 42. Works numbers were 19497, 19500 in August 1901; 19673-19675 in November.

All of this class were converted in 1916 to 0-8-0 switchers. As such, they were taken into the Southern Pacific in 1924.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12522
RailroadSouth Western of Arizona (EP&SW)
Number in Class1
Road Numbers2-6 / 50-54 / 209-213
Number Built1
BuilderBurnham, Williams & Co
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase14.25'
Engine Wheelbase22.83'
Ratio of driving wheelbase to overall engine wheebase 0.62
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers154000 lbs
Engine Weight170000 lbs
Tender Light Weight100000 lbs
Total Engine and Tender Weight270000 lbs
Tender Water Capacity5000 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)64 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter51"
Boiler Pressure190 psi
Cylinders (dia x stroke)22" x 28"
Tractive Effort42915 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.59
Heating Ability
Firebox Area200 sq. ft
Grate Area37 sq. ft
Evaporative Heating Surface2630 sq. ft
Superheating Surface
Combined Heating Surface2630 sq. ft
Evaporative Heating Surface/Cylinder Volume213.49
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7030
Same as above plus superheater percentage7030
Same as above but substitute firebox area for grate area38000
Power L14759
Power MT272.51

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