| ATSF 3450 class |
|---|
 |
|
|
| Specifications |
|---|
Configuration:
|
|
|---|
| • Whyte |
4-6-4 |
|---|
| • UIC |
2′C2′ h |
|---|
| Gauge |
4 ft 8 1⁄2 in (1,435 mm) standard gauge |
|---|
| Driver dia. |
73 in (1,854 mm), later: 79 in (2,007 mm) |
|---|
| Length |
97 ft 11 in (29.85 m) |
|---|
| Adhesive weight |
198,000 lb (90,000 kilograms; 90 metric tons) |
|---|
| Loco weight |
343,900 lb (156,000 kilograms; 156.0 metric tons) |
|---|
| Total weight |
639,260 lb (289,960 kilograms; 289.96 metric tons) |
|---|
| Fuel type |
Oil |
|---|
| Fuel capacity |
5,000 US gal (19,000 l; 4,200 imp gal) |
|---|
| Water cap |
15,000 US gal (57,000 l; 12,000 imp gal) |
|---|
Firebox:
• Firegrate area |
88 sq ft (8.2 m2) |
|---|
| Boiler pressure |
220 lbf/in2 (1.52 MPa), later: 230 lbf/in2 (1.59 MPa) |
|---|
| Cylinders |
Two, outside |
|---|
| Cylinder size |
25 in × 28 in (635 mm × 711 mm) |
|---|
| Valve gear |
Walschaerts |
|---|
| Valve type |
Piston valves |
|---|
|
| Performance figures |
|---|
| Tractive effort |
44,250 lbf (196.8 kN), later: 43,300 lbf (192.6 kN) |
|---|
|
|
|
The Atchison, Topeka and Santa Fe Railway's 3450 class comprised ten 4-6-4 "Hudson" type steam locomotives built by the Baldwin Locomotive Works in 1927. Built as coal-burners, they were converted to oil-burning during the 1930s. At the same time, the locomotives were given 79-inch (2,007 mm) driving wheels instead of their original 73-inch (1,854 mm), and the boiler pressures increased from 220 to 230 lbf/in2 (1.52 to 1.59 MPa). Combined, these changes reduced the starting tractive effort from 44,250 to 43,300 lbf (196.8 to 192.6 kN), but increased the top speed and efficiency. Their early service was in the Midwest, between Chicago, Illinois and Colorado; later, some were assigned to service in the San Joaquin Valley of California between Bakersfield and Oakland.
They were smaller and less powerful locomotives than the later 3460 class, but were capable of equivalently high speeds.
The first locomotive built, #3450, was donated by the Santa Fe in 1955 to the Railway and Locomotive Historical Society's Southern California chapter, and is preserved at the Society's museum in the Los Angeles County Fairgrounds at Pomona, California. It is not in operational condition but is preserved in good condition as a static exhibit. Visitors can feel like an engineer and blow the classic ATSF 6 chime whistle which receives pressure from an air compressor.
3450 4-6-4 steam locomotive
Front of #3450
Side of #3450