Pioneer Mining 0-4-2 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Sam (Locobase 11660)

Data from Baldwin Locomotive Works Specification for Engines, 1888, as digitized by the DeGolyer Library of Southern Methodist University Volume 14, p. 73. Works number was 9039 in February 1888.

Specifications by Steve Llanso of Sweat House Media
Locobase ID11660
RailroadPioneer Mining
Number in Class1
Road Numbers2
Number Built1
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 4.50'
Engine Wheelbase10.75'
Ratio of driving wheelbase to overall engine wheebase 0.42
Overall Wheelbase (engine & tender)10.75'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers20000 lbs
Engine Weight27000 lbs
Tender Light Weight
Total Engine and Tender Weight27000 lbs
Tender Water Capacity400 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)17 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter35"
Boiler Pressure130 psi
Cylinders (dia x stroke)9" x 16"
Tractive Effort4092 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.89
Heating Ability
Firebox Area33.30 sq. ft
Grate Area8 sq. ft
Evaporative Heating Surface295 sq. ft
Superheating Surface
Combined Heating Surface295 sq. ft
Evaporative Heating Surface/Cylinder Volume250.40
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1040
Same as above plus superheater percentage1040
Same as above but substitute firebox area for grate area4329
Power L12971
Power MT654.99


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