Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 53, pp. 259. Works number was 44660 in December 1916.
Five years after Baldwin had delivered its last Atlantic to a Southern Pacific subsidiary, this Virginia shortline coal road ordered one. It had a large grate, firebox with 21 sq ft (1.95 sq m) of arch tubes, and a saturated boiler. It rolled on 80 lb/yard (40 kg/metre) rail.
Likely because it couldn't afford to waste any equipment it had already paid for, the IRR didn't retire this single passenger engine until 1939.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 9 |
| Locobase ID | 13235 |
| Railroad | Interstate (IRR) |
| Country | USA |
| Whyte | 4-4-2 |
| Number in Class | 1 |
| Road Numbers | 9 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1916 |
| Valve Gear | Southern |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6.50 / 1.98 |
| Engine Wheelbase (ft / m) | 27.25 / 8.31 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.24 |
| Overall Wheelbase (engine & tender) (ft / m) | 56.10 / 17.10 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 100,000 / 45,359 |
| Engine Weight (lbs / kg) | 181,000 / 82,100 |
| Tender Loaded Weight (lbs / kg) | 115,000 / 52,163 |
| Total Engine and Tender Weight (lbs / kg) | 296,000 / 134,263 |
| Tender Water Capacity (gals / ML) | 6000 / 22.73 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 12 / 11 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 83 / 41.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 66 / 1676 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20" x 26" / 508x660 |
| Tractive Effort (lbs / kg) | 26,788 / 12150.85 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.73 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 331 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 15.50 / 4.72 |
| Firebox Area (sq ft / m2) | 208 / 19.32 |
| Grate Area (sq ft / m2) | 49.50 / 4.60 |
| Evaporative Heating Surface (sq ft / m2) | 2672 / 248.23 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 2672 / 248.23 |
| Evaporative Heating Surface/Cylinder Volume | 282.75 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 9900 |
| Same as above plus superheater percentage | 9900 |
| Same as above but substitute firebox area for grate area | 41,600 |
| Power L1 | 8642 |
| Power MT | 381.05 |