Data from MP 8 -1936 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.
Although Locobase has not yet included many North American switchers, he couldn't resist the unusual lineaments of this home-built. In addition to the saddle tank, this design sported widely spaced axles the spacing which was 7 ft 8 in (2.34 m) between the first and second and a full 9 feet (2.74 m) between the second and third. Add to that inside valve gear, rounded dome over the firebox and thus separating the saddle tank from the cab and IGN had a distinctive little locomotive..
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | SW-55 |
| Locobase ID | 11188 |
| Railroad | International & Great Northern (MP) |
| Country | USA |
| Whyte | 0-6-0ST |
| Number in Class | 1 |
| Road Numbers | 9575 |
| Gauge | Std |
| Number Built | 1 |
| Builder | IGN |
| Year | 1897 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 16.67 / 5.08 |
| Engine Wheelbase (ft / m) | 16.67 / 5.08 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 16.67 / 5.08 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 130,000 / 58,967 |
| Engine Weight (lbs / kg) | 130,000 / 58,967 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 130,000 |
| Tender Water Capacity (gals / ML) | 2000 / 7.58 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3 / 3 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 72 / 36 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 55 / 1397 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 24" / 406x610 |
| Tractive Effort (lbs / kg) | 14,243 / 6460.52 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 9.13 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 188 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11.83 / 3.61 |
| Firebox Area (sq ft / m2) | 104 / 9.67 |
| Grate Area (sq ft / m2) | 17 / 1.58 |
| Evaporative Heating Surface (sq ft / m2) | 1268 / 117.84 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1268 / 117.84 |
| Evaporative Heating Surface/Cylinder Volume | 226.83 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2550 |
| Same as above plus superheater percentage | 2550 |
| Same as above but substitute firebox area for grate area | 15,600 |
| Power L1 | 4398 |
| Power MT | 223.75 |