Data from AT&SF diagram drafted on 15 December 1930 and reproduced in E D Worley, Iron Horses of the Santa Fe (Dallas: Southwest Railroad Historical Society, 1976). p. 377.
Worley comments that this idea seems to have represented a continuing interest in Mallets that now was based on their successful 2-10-4 "Madame Queen" (Locobase 457). The enormous grate was 22 feet (6.71 m) long, just six inches shorter than the boiler tubes; its coal consumption was calculated at 142 lb/sq ft (693.3 kg/sq m) . Although the diagram doesn't explicitly say so, all four cylinders must have taken live steam because the HP/LP volume ratio would otherwise have sunk to an improbable 1.23.
NB: Superheater area and tube counts are an estimate. As the diagram shows no figures for tube counts or superheating area, Locobase feels free to make a SWAG based on the Madame Queen.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | ConsolDecapod? |
| Locobase ID | 16142 |
| Railroad | Atchison, Topeka & Santa Fe (ATSF) |
| Country | USA |
| Whyte | 2-8-10-2 |
| Number in Class | 1 |
| Road Numbers | Proposed |
| Gauge | Std |
| Number Built | |
| Builder | Santa Fe |
| Year | 1930 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 42.50 / 12.95 |
| Engine Wheelbase (ft / m) | 73.75 / 22.48 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.58 |
| Overall Wheelbase (engine & tender) (ft / m) | 127.79 / 38.95 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 70,000 / 31,752 |
| Weight on Drivers (lbs / kg) | 630,000 / 285,764 |
| Engine Weight (lbs / kg) | 730,000 / 331,123 |
| Tender Loaded Weight (lbs / kg) | 410,000 / 185,973 |
| Total Engine and Tender Weight (lbs / kg) | 1,140,000 / 517,096 |
| Tender Water Capacity (gals / ML) | 22,000 / 83.33 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 30 / 27 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 69 / 1753 |
| Boiler Pressure (psi / kPa) | 275 / 1900 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 27" x 34" / 686x864 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 30" x 34" / 762x864 |
| Tractive Effort (lbs / kg) | 187,630 / 85107.64 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.36 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 42 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 340 - 3.5" / 89 |
| Flue/Tube length (ft / m) | 22.50 / 6.86 |
| Firebox Area (sq ft / m2) | 788 / 73.21 |
| Grate Area (sq ft / m2) | 175 / 16.26 |
| Evaporative Heating Surface (sq ft / m2) | 8348 / 775.84 |
| Superheating Surface (sq ft / m2) | 4000 / 371.75 |
| Combined Heating Surface (sq ft / m2) | 12,348 / 1147.59 |
| Evaporative Heating Surface/Cylinder Volume | 370.47 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 48,125 |
| Same as above plus superheater percentage | 63,525 |
| Same as above but substitute firebox area for grate area | 286,044 |
| Power L1 | 30,330 |
| Power MT | |