South Florida 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Herald (Locobase 16254)

Data from Baldwin Locomotive Works Specification for Engines, as digitized by the DeGolyer Library of Southern Methodist University, Volume 10, p. 125. For the South Florida, see also Donald R. Hensley, Jr., "The South Florida Railroad", TAP LINES website at [], last accessed 26 January 2017. Works number was 5435 in January 1881.

This is one of the smallest Moguls in Locobase as of early 2017. Its tiny boiler, tiny firebox (see the explanation of the estimated area below), tiny grate served the SFRR for four years before it was sold to the Orange Belt Railroad in 1885 as their #1.

NB: The direct heating surface was calculated by assuming a cubic firebox and adding up the calculated square areas of the front tubesheet, the two sides, and the crown sheet. It is an estimate, but one that gains credibility with several other Baldwin designs with exactly the same firebox (e.g. Locobase 12024) for which the area is known.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID16254
RailroadSouth Florida
Number in Class1
Road Numbers2
Number Built1
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.50 / 2.59
Engine Wheelbase (ft / m)13.58 / 4.14
Ratio of driving wheelbase to overall engine wheelbase 0.63
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)18,000 / 8165
Engine Weight (lbs / kg)23,000 / 10,433
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1000 / 3.79
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)10 / 5
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)35 / 889
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)9" x 16" / 229x406
Tractive Effort (lbs / kg)4092 / 1856.10
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.40
Heating Ability
Tubes (number - dia) (in / mm)68 - 1.5" / 38
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 6.20 / 1.89
Firebox Area (sq ft / m2)20.70 / 1.92
Grate Area (sq ft / m2) 5.50 / 0.51
Evaporative Heating Surface (sq ft / m2)187 / 17.37
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)187 / 17.37
Evaporative Heating Surface/Cylinder Volume158.47
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation715
Same as above plus superheater percentage715
Same as above but substitute firebox area for grate area2691
Power L11867
Power MT686.00

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