Firebox had combustion chamber
This first series of 10 Hudsons had the same boiler as the 3400-series Pacifics, but a much bigger grate. Retrofitted in the late 1930s with redesigned tube layout and larger, 79-in drivers. Retired in 1952-1956
Compare with later 3460 series (Locobase 449).
Built 10 years later than the 3450 series (Locobase 406), these engines show the impact of the superpower revolution. Relatively high-drivered type on S.K.F. roller bearings but, unlike the Northwestern and Milwaukee Road engines, 5 of the six were never streamlined. The firebox sports 95 sq ft of thermic syphons and arch tubes, tube and flue ratios are reversed, the boiler is much larger and has a much larger superheater area. Boiler pressure increased by 36%.
Although tractive effort is only 10% higher, the drier steam must have given the engines disproportionately more power. 3461 showed the class's long legs when it ran the full 2,227 miles from Los Angeles to Chicago in December 1937, making five fuel stops along the way. The average speed was 45.4 mph with top speeds of 90.
See Locobase 125 for the 1945 rebuild into possibly the most powerful express passenger locomotive ever. Retired in 1956.
Santa Fe rebuilt the 3460-series Hudsons described in Locobase 449 in 1945, installing a new arrangement of tubes and flues. The engine had 108 sq ft of thermic duplex syphons in the firebox and security water circulators in the 25-in combustion chamber.
| Specifications | |||
|---|---|---|---|
| Class | 3450 | 3460 | 3460 |
| Locobase ID | 406 | 449 | 125 |
| Railroad | Santa Fe (ATSF) | Santa Fe (ATSF) | Santa Fe (ATSF) |
| Whyte | 4-6-4 | 4-6-4 | 4-6-4 |
| Road Numbers | 3450-3459 | 3460-3465 | 3460 |
| Gauge | Std | Std | Std |
| Builder | Baldwin | Baldwin | Santa Fe |
| Year | 1927 | 1938 | 1945 |
| Valve Gear | Walschaert | Baker | Baker |
| Locomotive Length and Weight | |||
| Driver Wheelbase | 13.67' | 14.50' | 14.50' |
| Engine Wheelbase | 38.58' | 41.10' | 41.10' |
| Ratio of driving wheelbase to overall engine wheebase | 0.35 | 0.35 | 0.35 |
| Overall Wheelbase (engine & tender) | 81.38' | 88.67' | 88.67' |
| Axle Loading (Maximum Weight per Axle) | 71600 lbs | ||
| Weight on Drivers | 198300 lbs | 213440 lbs | 210800 lbs |
| Engine Weight | 343500 lbs | 412330 lbs | 417300 lbs |
| Tender Light Weight | 287000 lbs | 396340 lbs | 396246 lbs |
| Total Engine and Tender Weight | 630500 lbs | 808670 lbs | 813546 lbs |
| Tender Water Capacity | 15000 gals | 20000 gals | 20000 gals |
| Tender Fuel Capacity (oil/coal) | 5000 gals | 7000 gals | 7108 gals |
| Minimum weight per yard of rail on which locomotive could run | 110.17 lb rail | 118.58 lb rail | 117.11 lb rail |
| Geometry Relating to Tractive Effort | |||
| Driver Diameter | 74" | 84" | 84" |
| Boiler Pressure | 220 psi | 300 psi | 300 psi |
| Cylinders (dia x stroke) | 25" x 28" | 23.5" x 29" | 23.5" x 29.5" |
| Tractive Effort | 44223 lbs | 48618 lbs | 49456 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.48 | 4.39 | 4.26 |
| Heating Ability | |||
| Firebox Area | 268 sq. ft | 375 sq. ft | 433 sq. ft |
| Grate Area | 88 sq. ft | 98.50 sq. ft | 99 sq. ft |
| Evaporative Heating Surface | 4108 | 4770 | 4303 |
| Superheating Surface | 980 | 2080 | 2020 |
| Combined Heating Surface | 5088 | 6850 | 6323 |
| Evaporative Heating Surface/Cylinder Volume | 258.24 | 327.65 | 290.56 |
| Computations Relating to Power Output (More Information) | |||
| Robert LeMassena's Power Computation | 19360 | 29550 | 29700 |
| Same as above plus superheater percentage | 23088.93 | 38522.85 | 39188.22 |
| Same as above but substitute firebox area for grate area | 70316.29 | 146660.58 | 171398.97 |
| Power L1 | 24336.16 | 73176.95 | 69903.21 |
| Power MT | 811.68 | 2267.53 | 2193.22 |
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