Known to the Santa Fe as a "Consolidation Mallet," these two engines were rebuilt from 2-8-0s at Topeka in 1911. Like other Santa Fe mallets, this class has an additional 2,383 sq ft ahead of the tube sheets as reheater space. Its grate area, on the other hand, was almost laughably small and was worked very hard. Another oddity was the weight distribution. On the front engine only the front driven axle carried as much as 50,000 lb (56,000 lb, actually) while the other three all bore 35,000-37,000 lb. The rear engine had a little more balance, but the axle loadings still varied from 42,500 lb (rearmost) to 54,000 lb (1st and 3rd).
The first engine -- 3296 -- later had its HP cylinders bushed to 22 inches (possibly because its maintainers could no longer get the original 24-in diameter true enough during reboring). Tractive effort rating dropped to 76,750 lb.
Restored to 2-8-0 arrangement in 1923.
| Specifications | |
|---|---|
| Class | 3296 |
| Locobase ID | 436 |
| Railroad | Santa Fe (ATSF) |
| Whyte | 2-8-8-0 |
| Road Numbers | 3296-3299 |
| Gauge | Std |
| Builder | Santa Fe |
| Year | 1911 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 41.50' |
| Engine Wheelbase | 51' |
| Ratio of driving wheelbase to overall engine wheebase | 0.81 |
| Overall Wheelbase (engine & tender) | 94.48' |
| Axle Loading (Maximum Weight per Axle) | 56000 lbs |
| Weight on Drivers | 366500 lbs |
| Engine Weight | 391500 lbs |
| Tender Light Weight | 234460 lbs |
| Total Engine and Tender Weight | 625960 lbs |
| Tender Water Capacity | 12000 gals |
| Tender Fuel Capacity (oil/coal) | 4000 gals |
| Minimum weight per yard of rail on which locomotive could run | 76.35 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 57" |
| Boiler Pressure | 200 psi |
| Cylinders (dia x stroke) | 24" x 32" |
| Low Pressure Cylinders (dia x stroke) | 38" x 32" |
| Tractive Effort | 78595 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.66 |
| Heating Ability | |
| Firebox Area | 157 sq. ft |
| Grate Area | 47.40 sq. ft |
| Evaporative Heating Surface | 2930 |
| Superheating Surface | 1922 |
| Combined Heating Surface | 4852 |
| Evaporative Heating Surface/Cylinder Volume | 174.87 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 9480 |
| Same as above plus superheater percentage | 13235.27 |
| Same as above but substitute firebox area for grate area | 43838.33 |
| Power L1 | 9504.92 |
| Power MT | 457.40 |
| This page last modified: . | [Contact] | All material © 1999-2008 SteamLocomotive.com |