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 ID11,660
RailroadPioneer Mining
Number in Class1
Road Numbers2
Number Built1
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 4.50
Engine Wheelbase (ft)10.75
Ratio of driving wheelbase to overall engine wheebase 0.42
Overall Wheelbase (engine & tender) (ft)10.75
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)20,000
Engine Weight (lbs)27,000
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)27,000
Tender Water Capacity (gals)400
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)17
Geometry Relating to Tractive Effort
Driver Diameter (in)35
Boiler Pressure (psi)130
High Pressure Cylinders (dia x stroke) (in)9" x 16"
Tractive Effort (lbs)4092
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.89
Heating Ability
Firebox Area (sq ft)33.30
Grate Area (sq ft)8
Evaporative Heating Surface (sq ft)295
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)295
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