S & A Lumber Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 101 (Locobase 14289)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 52, p. 318. Thanks to Chris Hohl for his 28 February 2015 email giving the fuel capacity. Works number was 42069 in May 1915.

These small wood-burning Prairies had relatively large tenders with more fuel capacity (4 cords of wood). Like most logging engines, the specs for this locomotive included an admonition that "springs to be extra heavy for rough track."

S & A operated in Marion and Putnam counties from its headquarters in Jacksonville, Fla.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID14,289
RailroadS & A Lumber Company
Number in Class1
Road Numbers101
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.17 / 2.80
Engine Wheelbase (ft / m)23.75 / 7.24
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender) (ft / m)49 / 13.72
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)70,000 / 31,752
Engine Weight (lbs / kg)89,200 / 39,916
Tender Loaded Weight (lbs / kg)90,000 / 27,216
Total Engine and Tender Weight (lbs / kg)179,200 / 67,132
Tender Water Capacity (gals / ML)4500 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT) / 5.50
Minimum weight of rail (calculated) (lb/yd / kg/m)39 / 19.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)41 / 1041
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)15" x 20" / 381x508
Tractive Effort (lbs / kg)16,793 / 7617.19
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.17
Heating Ability
Firebox Area (sq ft / m2)97 / 9.01
Grate Area (sq ft / m2)14 / 1.30
Evaporative Heating Surface (sq ft / m2)999 / 92.81
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)999 / 92.81
Evaporative Heating Surface/Cylinder Volume244.22
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2520
Same as above plus superheater percentage2520
Same as above but substitute firebox area for grate area17,460
Power L14462
Power MT421.59

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