Santa Fe class 5011

The Atchison, Topeka and Santa Fe Railway class 5011 was the last class of steam locomotives to be purchased by AT&SF. The class was introduced by Baldwin Locomotive Works in 1944.

Santa Fe 5011 class
#5017 at the National Railroad Museum next to Milwaukee Road 261 in 1970
Type and origin
Power typeSteam
BuilderBaldwin Locomotive Works
Serial number70817-70841
Build date1944
Total produced25
Specifications
Configuration:
​
 • Whyte2-10-4
 • UIC1′E2′ h2
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.74 in (1,880 mm)
WheelbaseLoco & tender: 98.64 ft (30.07 m)
Length123 ft 5 in (37.62 m)
Height16 ft 0 in (4.88 m)
Axle load76,060 lb (34,500 kilograms; 34.50 metric tons)
Adhesive weight380,300 lb (172,500 kilograms; 172.5 metric tons)
Loco weight538,000 lb (244,000 kilograms; 244 metric tons)
Tender weight464,700 lb (210,800 kilograms; 210.8 metric tons)
Total weight1,002,700 lb (454,800 kilograms; 454.8 metric tons)
Fuel typeFuel oil
Fuel capacity7,000 US gal (26,000 L; 5,800 imp gal)
Water cap.24,500 US gal (93,000 L; 20,400 imp gal)
Firebox:
 • Firegrate area		121.70 sq ft (11.306 m2)
Boiler104 in (2,642 mm)
Boiler pressure310 lbf/in2 (2.14 MPa)
Heating surface:
 • Firebox		494 sq ft (45.9 m2)
Superheater:
​
 • Heating area2,640 sq ft (245 m2)
CylindersTwo
Cylinder size30 in × 34 in (762 mm × 864 mm)
Valve gearWalschaert
Performance figures
Maximum speed70 mph (110 km/h)
Power output5,660 hp (4,220 kW) @ 40 mph (64 km/h) (drawbar)
Tractive effort93,000 lbf (413.68 kN)
Factor of adh.4.06
Career
OperatorsSanta Fe
Class5011
Numbers5011–5035
Retired1950-1959
PreservedFour (Nos. 5011, 5017, 5021 and 5030) preserved
Scrapped1953-1963
DispositionNos. 5011, 5017, 5021 and 5030 on display, remainder scrapped

History

A total of 25 of these large engines were built. They were nicknamed "War Babies" by the AT&SF from being built and used during World War II.

The AT&SF ran the class from the mid-1940s to the mid-late 1950s. Despite being mainly freight haulers, their driving wheels were unusually tall for a "Texas" type, which led to them also being successful in passenger service.[1]

Specifications

Numbers 5011 to 5035, when built, were the largest and fastest class of "Texas"-type locomotives ever built and equipped with Timken roller bearings on every axle.

The engines had a maximum output of 5,600 horsepower (4,200 kW) measured at the rear of the tender, at a top speed of 70 miles per hour (110 km/h).

Present day
#5011 at the National Museum of Transportation in 2004

Four of the class 5011 locomotives were preserved by the AT&SF for museums, with the remainder being scrapped.

The four preserved locomotives are:

See also
  • Steam locomotives of the United States
  • Atchison, Topeka and Santa Fe Railway locomotives
  • Baldwin locomotives

References
  1. "Atchison, Topeka & Santa Fe 2-10-4 "Texas" Locomotives in the USA".
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