Alaska Railroad 0-4-2 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class A1 (Locobase 14135)

Data from (visited 12 May 2012) Works number was 47317 in July 1910.

The Alaska rails site gives the working pressure as 165 psi and the tractive effort as 15,350 lb (6,962 kg), which required a working pressure of 185 psi to achieve. The boiler's principal water supply lay as a saddle over the boiler (thus, a saddle tanker), but the engine also trailed a tender

Specifications by Steve Llanso of Sweat House Media
Locobase ID14135
RailroadAlaska Railroad
Number in Class1
Road Numbers1
Number Built1
Valve Gearlink
Locomotive Length and Weight
Driver Wheelbase7'
Engine Wheelbase14.92'
Ratio of driving wheelbase to overall engine wheebase 0.47
Overall Wheelbase (engine & tender)14.92'
Axle Loading (Maximum Weight per Axle)37000 lbs
Weight on Drivers71000 lbs
Engine Weight82000 lbs
Tender Light Weight
Total Engine and Tender Weight82000 lbs
Tender Water Capacity1700 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)59 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure165 psi
Cylinders (dia x stroke)14" x 22"
Tractive Effort13745 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.17
Heating Ability
Firebox Area
Grate Area
Evaporative Heating Surface650 sq. ft
Superheating Surface
Combined Heating Surface650 sq. ft
Evaporative Heating Surface/Cylinder Volume165.83
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation0
Same as above plus superheater percentage0
Same as above but substitute firebox area for grate area0
Power L10
Power MT0


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