ATSF 3450 class

ATSF 3450 class
Type and origin
Power type Steam
Builder Baldwin Locomotive Works
Build date 1927
Total produced 10
Specifications
Configuration 4-6-4
UIC classification 2′C2′ h
Gauge 4 ft 8 1⁄2 in (1,435 mm)
Driver diameter 73 in (1,854 mm), later: 79 in (2,007 mm)
Length 97 ft 11 in (29.85 m)
Weight on drivers 198,000 lb (89.8 tonnes)
Locomotive weight 343,900 lb (156.0 tonnes)
Locomotive and tender
combined weight		 639,260 lb (290.0 tonnes)
Fuel type Oil
Fuel capacity 5,000 US gal (19,000 l; 4,200 imp gal)
Water capacity 15,000 US gal (57,000 l; 12,000 imp gal)
Boiler pressure 220 lbf/in2 (1.52 MPa), later: 230 lbf/in2 (1.59 MPa)
Firegrate area 88 sq ft (8.2 m2)
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)
Career
Operator(s) Atchison, Topeka and Santa Fe Railway
Number(s) 3450–3459
Disposition 3450 preserved, remainder scrapped

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 driving wheels instead of their original 73-inch, 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.

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