Boiler had feedwater heater. Described by Drury (1993) as "basically good 1922 engines with a 1927 wheel arrangement." (An assessment borne out by the tube-to-flue ratio.)
15 engines delivered in 1927, retired in 1954.
| Specifications | |
|---|---|
| Class | 4101 |
| Locobase ID | 469 |
| Railroad | Santa Fe (ATSF) |
| Whyte | 2-8-4 |
| Road Numbers | 4101-4115 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1927 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 16.50' |
| Engine Wheelbase | 37.20' |
| Ratio of driving wheelbase to overall engine wheebase | 0.44 |
| Overall Wheelbase (engine & tender) | 81.60' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 268200 lbs |
| Engine Weight | 396500 lbs |
| Tender Light Weight | 285100 lbs |
| Total Engine and Tender Weight | 681600 lbs |
| Tender Water Capacity | 15000 gals |
| Tender Fuel Capacity (oil/coal) | 20 tons |
| Minimum weight per yard of rail on which locomotive could run | 111.75 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 63" |
| Boiler Pressure | 220 psi |
| Cylinders (dia x stroke) | 27" x 32" |
| Tractive Effort | 69243 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.87 |
| Heating Ability | |
| Firebox Area | 338 sq. ft |
| Grate Area | 99 sq. ft |
| Evaporative Heating Surface | 4577 |
| Superheating Surface | 1246 |
| Combined Heating Surface | 5823 |
| Evaporative Heating Surface/Cylinder Volume | 215.84 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 21780 |
| Same as above plus superheater percentage | 26440.46 |
| Same as above but substitute firebox area for grate area | 90271.48 |
| Power L1 | 19042.53 |
| Power MT | 626.12 |
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