Americus, Preston & Lumpkin 4-4-0 "American" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class W A Gregory (Locobase 11856)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 13, p. 122. Works number was 8145 in September 1886. See for a history of this railroad

The AP & L was chartered in 1884 It would be the only railroad in Georgia to use only local financing, primarily from wealthy investors in Americus itself. Its original construction as a narrow-gauge line among the three named towns, the latter two county seats without rail service of any kind, provided energy of its own. The instant Eight-wheeler in this entry may have been modest in scale, but it supported a new level of accessibility.

See Locobase 11575 for the SAM's later history.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassW A Gregory
Locobase ID11,856
RailroadAmericus, Preston & Lumpkin (SAM)
Number in Class1
Road Numbers3
Number Built1
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.17 / 2.19
Engine Wheelbase (ft / m)18.25 / 5.56
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)26,000 / 11,793
Engine Weight (lbs / kg)39,000 / 17,690
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1200 / 4.55
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)22 / 11
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43 / 1092
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)12" x 16" / 305x406
Tractive Effort (lbs / kg)5921 / 2685.72
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.39
Heating Ability
Firebox Area (sq ft / m2)52 / 4.83
Grate Area (sq ft / m2) 8.10 / 0.75
Evaporative Heating Surface (sq ft / m2)439 / 40.80
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)439 / 40.80
Evaporative Heating Surface/Cylinder Volume209.61
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1053
Same as above plus superheater percentage1053
Same as above but substitute firebox area for grate area6760
Power L13109
Power MT527.24

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Wes Barris