Bonhomie & Hattiesburg Southern 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 250 (Locobase 15319)

Data from DeGolyer Library of Southern Methodist University Baldwin Specifications, Vol 80, pp. 220+. Works number was 59239 in May 1926.

As the B&HS settled into its post-ICC working life, it acquired a few locomotives including this mixed-train Prairie. It used relative large 11" (279 mm) piston valves. It traveled over a gentle right of way that had 0.75% grades and nearly straight 4 degree (radii of 1,433 feet/436.8 metres).

Its post-revenue-service life began in 1963 when the 250 was sold to the Wanamaker, Kempton & Southern, which put it on display at the Edaville Railroad in Massachusetts. The 250 later moved to the Wolfeboro Railroad, where it is stored in Wolfeboro, NH.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID15,319
RailroadBonhomie & Hattiesburg Southern
Number in Class1
Road Numbers250
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.33 / 3.15
Engine Wheelbase (ft / m)28.67 / 8.74
Ratio of driving wheelbase to overall engine wheebase 0.36
Overall Wheelbase (engine & tender) (ft / m)55.37 / 16.88
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)110,000 / 49,895
Engine Weight (lbs / kg)148,000 / 67,132
Tender Loaded Weight (lbs / kg)115,600 / 52,435
Total Engine and Tender Weight (lbs / kg)263,600 / 119,567
Tender Water Capacity (gals / ML)5500 / 20.83
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)9 / 8.20
Minimum weight of rail (calculated) (lb/yd / kg/m)61 / 30.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)52 / 1321
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)20" x 24" / 508x610
Tractive Effort (lbs / kg)28,246 / 12812.19
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.89
Heating Ability
Firebox Area (sq ft / m2)121 / 11.24
Grate Area (sq ft / m2)29.50 / 2.74
Evaporative Heating Surface (sq ft / m2)1684 / 156.45
Superheating Surface (sq ft / m2)389 / 36.14
Combined Heating Surface (sq ft / m2)2073 / 192.59
Evaporative Heating Surface/Cylinder Volume192.97
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5310
Same as above plus superheater percentage6319
Same as above but substitute firebox area for grate area25,918
Power L110,350
Power MT622.30

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Wes Barris