Data from DeGolyer Library of Southern Methodist University Baldwin Specifications, Vol 80, pp. 220+. (Thanks to Andrew Scoledge for his 12 November 2023 email correcting the 250's current location.) 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.
Andrew Scoledge visited the Edaville in November 2023 and reported that the 250 was still displayed. Visitors could access the cab and its fireman's side.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 250 |
| Locobase ID | 15319 |
| Railroad | Bonhomie & Hattiesburg Southern |
| Country | USA |
| Whyte | 2-6-2 |
| Number in Class | 1 |
| Road Numbers | 250 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1926 |
| Valve Gear | Walschaert |
| 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 wheelbase | 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 / Liters/MT) | 9 / 8 |
| 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 / 1240 |
| 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 | |
| Tubes (number - dia) (in / mm) | 150 - 2" / 51 |
| Flues (number - dia) (in / mm) | 24 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 14 / 4.27 |
| 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 Volume | 192.90 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5310 |
| Same as above plus superheater percentage | 6319 |
| Same as above but substitute firebox area for grate area | 25,918 |
| Power L1 | 10,346 |
| Power MT | 622.06 |