Florida & Alabama 2-6-2 "Prairie" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class 18 (Locobase 14267)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 62, p. 348+.(Many thanks to Chris Hohl for 2 June 2015 email flagging an error in the driver diameter and noting the different fuels in the two locomotives.) Works numbers were 52850, 52918 in January 1920.

Locobases 14265-14266 show the four logging Prairies (14-17) that came to the WB Harbeson Lumber Company of De Funiak Springs. The last one trailed a larger tender, but was otherwise identical.

This next batch were bigger, had more cylinder volume, rolled on taller drivers and longer wheelbases, and had superheated boilers and larger fireboxes. Unlike the other two 1920 batches, which bore Bagdad Land and Lumber Company on their tenders, this pair was assigned to the F&A in Munson, Fla.

18 burned soft coal and had the tender shown in the specs. 19 burned oil; its tender carried 1,800 US gallons (6,831 litres) of oil in addition to the 4,000 gallons of water.

18 later worked the Mobile River Saw Mill Company. It then enjoyed a second career on tourist roads such as the Reese Central Railroad owned by Fred Stock, and the Dry Gulch & Tombstone Railroad.

19 was sold to locomotive rebuilder/reseller Georgia Car & Locomotive, which found a buyer in the Roscoe, Snyder & Pacific of Roscoe, Tex as their #5. After its operating days ended, it went on display.

Principal Dimensions by Steve Llanso of Sweat House Media
Class18
Locobase ID14,267
RailroadFlorida & Alabama
CountryUSA
Whyte2-6-2
Number in Class2
Road Numbers18-19
GaugeStd
Number Built2
BuilderBaldwin
Year1920
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.25 / 3.12
Engine Wheelbase (ft / m)26.83 / 8.18
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender) (ft / m)50.37 / 15.35
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)98,000 / 44,452
Engine Weight (lbs / kg)127,800 / 57,969
Tender Loaded Weight (lbs / kg)80,000 / 36,287
Total Engine and Tender Weight (lbs / kg)207,800 / 94,256
Tender Water Capacity (gals / ML)4000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)8 / 7.30
Minimum weight of rail (calculated) (lb/yd / kg/m)54 / 27
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1118
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)21,224 / 9627.06
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.62
Heating Ability
Firebox Area (sq ft / m2)100 / 9.29
Grate Area (sq ft / m2)18.70 / 1.74
Evaporative Heating Surface (sq ft / m2)1248 / 115.94
Superheating Surface (sq ft / m2)292 / 27.13
Combined Heating Surface (sq ft / m2)1540 / 143.07
Evaporative Heating Surface/Cylinder Volume197.94
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3366
Same as above plus superheater percentage4006
Same as above but substitute firebox area for grate area21,420
Power L110,411
Power MT702.62