Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 31, p. 78. See also Richard E Prince, Seaboard Air Line Railway: steam boats, locomotives, and history (Indiana University Press, 1969), p. 121, and "Phosphate Mining," The American Fertilizer, Volume 36 (6 April 1912), pp. 46-50. Baldwin works numbers were 32173 and 32220 in November 1907 and 37692 in April 1912.
Surface-mining hard-rock phosphate deposits in Florida led to the incorporation of the Dunnellon Phosphate Company. They bought up the Standard & Hernando, which had built 13 miles from Hernando to Rockwell Junction, and extended the line to Port Inglis; all track weight 56 lb/yard (28 kg/metre). According to Prince, this gave them a port that they developed as a phosphate exporter.
As the decade wore on, mileage increased to 28 miles and traffic included some fruit movement and some saw-mill output. The Seaboard created the Florida Central & Gulf in 1916 to run the S & H trackage. It was abandoned in 1931.
The first two Ten-wheelers in this class came to Dunnellon at a time when such Ten-wheelers were typical light freight engines in the South. Both stayed with this line until it was closed in 1931. 9 arrived 5 years later and apparently was one engine too many so it was sold to the Tavares & Gulf as their 106 in 1919. After a short stint with the T & G, 106 was claimed by locomotive rebuilder/reseller Southern Iron & Equipment. In November 1921, Grand Prairie Gravel bought the 106.
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | 7 |
Locobase ID | 13205 |
Railroad | Dunnellon Phosphate Company |
Country | USA |
Whyte | 4-6-0 |
Number in Class | 3 |
Road Numbers | 8, 7, 9 |
Gauge | Std |
Number Built | 3 |
Builder | Burnham, Williams & Co |
Year | 1907 |
Valve Gear | Stephenson |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 11.33 / 3.45 |
Engine Wheelbase (ft / m) | 22.17 / 6.76 |
Ratio of driving wheelbase to overall engine wheelbase | 0.51 |
Overall Wheelbase (engine & tender) (ft / m) | 48.87 / 14.90 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 92,500 / 41,957 |
Engine Weight (lbs / kg) | 116,500 / 52,844 |
Tender Loaded Weight (lbs / kg) | 90,000 / 40,823 |
Total Engine and Tender Weight (lbs / kg) | 206,500 / 93,667 |
Tender Water Capacity (gals / ML) | 4500 / 17.05 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 51 / 25.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 56 / 1422 |
Boiler Pressure (psi / kPa) | 180 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 26" / 457x660 |
Tractive Effort (lbs / kg) | 23,016 / 10439.89 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.02 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 260 - 2" / 51 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 13.08 / 3.99 |
Firebox Area (sq ft / m2) | 152 / 14.13 |
Grate Area (sq ft / m2) | 22.40 / 2.08 |
Evaporative Heating Surface (sq ft / m2) | 1920 / 178.44 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 1920 / 178.44 |
Evaporative Heating Surface/Cylinder Volume | 250.65 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 4032 |
Same as above plus superheater percentage | 4032 |
Same as above but substitute firebox area for grate area | 27,360 |
Power L1 | 5878 |
Power MT | 420.28 |