Gila Valley, Globe & Northern 4-4-0 "American" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 12264)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 21, p. 157. Works number was 15810 in March 1898.

Locobase wonders if the specified operating boiler pressure remained in effect for long. Limitations on axle loading led to a calculated F/A of 3.26, which would render this small Eight-wheeler highly prone to slipping. Reducing the MEP to 150 psi would have made the 3 much more sure-footed.

This Arizona road ran the 3 for about 10 years before it was taken over by the Maricopa & Phoenix in April 1906 and renumbered 6. The M & P renumbered it 75 in 1907, then was taken over by the Arizona Eastern in December 1910. 75 bore the AE herald for less than 5 years before heading to the ferro-knacker in April 1915.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID12,264
RailroadGila Valley, Globe & Northern
Number in Class1
Road Numbers3 / 6 / 75
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)8 / 2.44
Engine Wheelbase (ft / m)21.75 / 6.63
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)51,000 / 23,133
Engine Weight (lbs / kg)75,000 / 34,019
Tender Loaded Weight (lbs / kg)65,000 / 29,484
Total Engine and Tender Weight (lbs / kg)140,000 / 63,503
Tender Water Capacity (gals / ML)3500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)3200 / 12.10
Minimum weight of rail (calculated) (lb/yd / kg/m)43 / 21.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60 / 1524
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x610
Tractive Effort (lbs / kg)15,667 / 7106.44
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.26
Heating Ability
Firebox Area (sq ft / m2)108 / 10.04
Grate Area (sq ft / m2)15.43 / 1.43
Evaporative Heating Surface (sq ft / m2)1057 / 98.23
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1057 / 98.23
Evaporative Heating Surface/Cylinder Volume189.26
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2777
Same as above plus superheater percentage2777
Same as above but substitute firebox area for grate area19,440
Power L15147
Power MT444.99

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Wes Barris