Pioneer Mining & Manufacturing 2-4-0 "Porter" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 10 (Locobase 12350)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 21, p. 278. works numbers were 16672 in April 1899 and 20131 in February 1902.


Class Pioneer (Locobase 11853)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 13, p. 110. Works number was 8126 in September 1886

It's odd to see a 2-4-0 arrangement with tender in American use after 1850, yet this little Six-wheeler handled duties for Pioneer supporting its hematite and coal mining near Thomas, Alabama for decades. In the late 1890s, PM & M built the 4-mile Thomas & Sayreton and assigned the Pioneer to that run.

By 1907, the 1 worked for Republic Steel, which had formed in 1899 and included Pioneer's three blast furnaces and the T & S.


Class Pioneer (Locobase 12302)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 21, p. 278. Works number was 16292 in November 1898.

See Locobase 11853 for the earlier 2-4-0 that Baldwin delivered to this Thomas, Ala ore-extraction company. Although the grate grew only slightly, the firebox sat deeper, the boiler had more tubes of the same length, cylinder diameter increased by 2", and the boiler pressure rose as well. Engine wheelbase actually decreased, but the tender was larger.

Specifications by Steve Llanso of Sweat House Media
Class10PioneerPioneer
Locobase ID12,350 11,853 12,302
RailroadPioneer Mining & ManufacturingPioneer Mining & ManufacturingPioneer Mining & Manufacturing
CountryUSAUSAUSA
Whyte2-4-02-4-02-4-0
Number in Class211
Road Numbers10, 1319
GaugeStdStdStd
Number Built211
BuilderBurnham, Williams & CoBurnham, Parry, Williams & CoBurnham, Williams & Co
Year189918861898
Valve GearStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 6.50 6.83 6.50
Engine Wheelbase (ft)1414.1714.08
Ratio of driving wheelbase to overall engine wheebase 0.46 0.48 0.46
Overall Wheelbase (engine & tender) (ft)37.6736.2119.92
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)53,00046,00070,000
Engine Weight (lbs)63,00056,00081,000
Tender Loaded Weight (lbs)47,00028,000
Total Engine and Tender Weight (lbs)110,000109,000
Tender Water Capacity (gals)200012001600
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)443858
Geometry Relating to Tractive Effort
Driver Diameter (in)484848
Boiler Pressure (psi)160140160
High Pressure Cylinders (dia x stroke) (in)15" x 22"15" x 22"17" x 22"
Tractive Effort (lbs)14,02512,27218,014
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.78 3.75 3.89
Heating Ability
Firebox Area (sq ft)80.9076.30104.40
Grate Area (sq ft)16.6015.5816.50
Evaporative Heating Surface (sq ft)7116751107
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)7116751107
Evaporative Heating Surface/Cylinder Volume158.01150.01191.54
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation265621812640
Same as above plus superheater percentage265621812640
Same as above but substitute firebox area for grate area12,94410,68216,704
Power L1317326303608
Power MT263.97252.09227.26


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