Union Pacific 4006

Specifications
Configuration:;
• Whyte	4-8-8-4
• UIC	(2′D)D2′ h4
Gauge	4 ft 8 1⁄2 in (1,435 mm) standard gauge
Leading dia.	36 in (914 mm)
Driver dia.	68 in (1,727 mm)
Trailing dia.	42 in (1,067 mm)
Wheelbase	72 ft 5.5 in (22.09 m)
Length	Locomotive: 85 ft 3.4 in (25.99 m); Overall: 132 ft 9 1⁄4 in (40.47 m)
Width	11 ft (3.4 m)
Height	16 ft 2 1⁄2 in (4.94 m)
Adhesive weight	540,000 lb (245,000 kg)
Loco weight	762,000 lb (345,600 kg)
Tender weight	342,200 lb (155,220 kg) (2/3 load)
Total weight	1,250,000 lb (567,000 kg)
Fuel type	Coal
Fuel capacity	28 short tons (25.4 t; 25.0 long tons)
Water cap	25,000 US gal (95,000 l; 21,000 imp gal)
Firebox:; • Firegrate area	150 sq ft (14 m2)
Boiler	95 in (2,400 mm)
Boiler pressure	300 lbf/in2 (2.1 MPa)
Heating surface	5,735 sq ft (533 m2)
• Tubes and flues	5,035 sq ft (468 m2)
• Firebox	720 sq ft (67 m2)
Superheater:;
• Type	Type A
• Heating area	2,043 sq ft (190 m2)
Cylinders	4
Cylinder size	23.75 in × 32 in (603 mm × 813 mm)

Type and origin
Power type	Steam
Builder	American Locomotive Company
Build date	1941

Union Pacific 4006
	Big Boy 4006 on display at the Museum of Transportation, outside of St. Louis, Missouri
Type and origin
Power type	Steam
Builder	American Locomotive Company
Build date	1941
Specifications
Configuration:;
• Whyte	4-8-8-4
• UIC	(2′D)D2′ h4
Gauge	4 ft 8 1⁄2 in (1,435 mm) standard gauge
Leading dia.	36 in (914 mm)
Driver dia.	68 in (1,727 mm)
Trailing dia.	42 in (1,067 mm)
Wheelbase	72 ft 5.5 in (22.09 m)
Length	Locomotive: 85 ft 3.4 in (25.99 m); Overall: 132 ft 9 1⁄4 in (40.47 m)
Width	11 ft (3.4 m)
Height	16 ft 2 1⁄2 in (4.94 m)
Adhesive weight	540,000 lb (245,000 kg)
Loco weight	762,000 lb (345,600 kg)
Tender weight	342,200 lb (155,220 kg) (2/3 load)
Total weight	1,250,000 lb (567,000 kg)
Fuel type	Coal
Fuel capacity	28 short tons (25.4 t; 25.0 long tons)
Water cap	25,000 US gal (95,000 l; 21,000 imp gal)
Firebox:; • Firegrate area	150 sq ft (14 m2)
Boiler	95 in (2,400 mm)
Boiler pressure	300 lbf/in2 (2.1 MPa)
Heating surface	5,735 sq ft (533 m2)
• Tubes and flues	5,035 sq ft (468 m2)
• Firebox	720 sq ft (67 m2)
Superheater:;
• Type	Type A
• Heating area	2,043 sq ft (190 m2)
Cylinders	4
Cylinder size	23.75 in × 32 in (603 mm × 813 mm)
Performance figures
Maximum speed	80 mph (130 km/h)
Power output	6,290 hp (4,690 kW)
Tractive effort	135,375 lbf (602.18 kN)
Factor of adh.	3.99
Career
Operators	Union Pacific Railroad
Class	4884-1
Disposition	Display
	Cost to build USD$265,000

Union Pacific 4006, one of the largest steam locomotives ever built, is a 4-8-8-4 Big Boy locomotive that was built in 1941 and retired in 1961 and is one of eight surviving Big Boys. This Big Boy also has the most mileage of all the Big Boys during its service years, traveling 1,064,625 miles.

This locomotive is on display at the Museum of Transportation in St. Louis, Missouri.

References

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