Firebox heating surface included 38 sq ft of arch tubes.
Note the square cylinder measurements; the stroke is usually longer than the cylinder bore is wide. Later members in the class built in 1924 ran at 220 lb psi and showed a slightly higher tractive effort.
Retired in 1950-1955.
| Specifications | |
|---|---|
| Class | 3700 |
| Locobase ID | 194 |
| Railroad | Santa Fe (ATSF) |
| Whyte | 4-8-2 |
| Road Numbers | 3700-3750 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1921 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 18' |
| Engine Wheelbase | 39.50' |
| Ratio of driving wheelbase to overall engine wheebase | 0.46 |
| Overall Wheelbase (engine & tender) | 76.78' |
| Axle Loading (Maximum Weight per Axle) | 60800 lbs |
| Weight on Drivers | 240640 lbs |
| Engine Weight | 355760 lbs |
| Tender Light Weight | 233720 lbs |
| Total Engine and Tender Weight | 589480 lbs |
| Tender Water Capacity | 12000 gals |
| Tender Fuel Capacity (oil/coal) | 16 tons |
| Minimum weight per yard of rail on which locomotive could run | 100.27 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 69" |
| Boiler Pressure | 200 psi |
| Cylinders (dia x stroke) | 28" x 28" |
| Tractive Effort | 54085 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.45 |
| Heating Ability | |
| Firebox Area | 373 sq. ft |
| Grate Area | 71.70 sq. ft |
| Evaporative Heating Surface | 4792 |
| Superheating Surface | 1087 |
| Combined Heating Surface | 5879 |
| Evaporative Heating Surface/Cylinder Volume | 240.14 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 14340 |
| Same as above plus superheater percentage | 16991.40 |
| Same as above but substitute firebox area for grate area | 88393.20 |
| Power L1 | 18948.70 |
| Power MT | 694.39 |
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