Greenlaw Lumber Company 2-8-0 "Consolidation" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 25 (Locobase 13713)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 36, p. 132. See also National Register of Historic Places Multiple Places Documentation Form, "Logging Railroad Resources of the Coconino and Kaibab Forests, Arizona, certification 1/5/1995, last accessed 14 November 2016 at . Works number was 35938 in January 1911.

Arizona Lumber and Timber Company of Flagstaff, Ariz bought the 25 for Greenlaw (based in Cliff, Ariz). The two entities' headquarters towns were not far apart and their railroad headed north to harvest timber near Doney Hill, the San Francisco range, and Sunset Crater. The NPS Documentation claims that the "Kaibab and the Coconino National Forests are part of the largest expanse of ponderosa pine in the world." It stretched in a belt 400 miles (644 km) long by as much as 60 miles (97 km) wide.

The Documentation adds that "timber barons" built more than 770 miles (1,240 km) of rail line to ensur e that "[a]lmost no virgin stand proved safe from the whistle of the locomotive."

The "2-spot" operated for Greenlaw for 14 years before being sold to the Central Arizona. Later it worked for the Saginaw & Manistee, which operated in Arizona in spite of its Michigan names.

A much later photograph of the preserved locomotive shows a rather oversized boiler on small drivers.

Specifications by Steve Llanso of Sweat House Media
Locobase ID13713
RailroadGreenlaw Lumber Company
Number in Class1
Road Numbers25
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase12.58'
Engine Wheelbase19.67'
Ratio of driving wheelbase to overall engine wheebase 0.64
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers101500 lbs
Engine Weight112500 lbs
Tender Light Weight80000 lbs
Total Engine and Tender Weight192500 lbs
Tender Water Capacity4000 gals
Tender Fuel Capacity (oil/coal)1200 gals
Minimum weight of rail (calculated)42 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure180 psi
Cylinders (dia x stroke)18" x 22"
Tractive Effort24786 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.10
Heating Ability
Firebox Area130.10 sq. ft
Grate Area22.20 sq. ft
Evaporative Heating Surface1378 sq. ft
Superheating Surface
Combined Heating Surface1378 sq. ft
Evaporative Heating Surface/Cylinder Volume212.67
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3996
Same as above plus superheater percentage3996
Same as above but substitute firebox area for grate area23418
Power L14132
Power MT358.99

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