Union Pacific 4006
Union Pacific 4006|
Big Boy 4006 on display at the Museum of Transportation, outside of St. Louis, Missouri |
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| Specifications |
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| Configuration |
4-8-8-4 |
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| UIC class |
(2′D)D2′ h4 |
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| Gauge |
4 ft 8 1⁄2 in (1,435 mm) standard gauge |
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| Leading dia |
36 in (914 mm) |
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| Driver diameter |
68 in (1,727 mm) |
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| Trailing dia |
42 in (1,067 mm) |
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| Wheelbase |
72 ft 5.5 in (22.09 m) |
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| Length |
Locomotive: 85 ft 3.4 in (25.99 m)
Overall: 132 ft 9 1⁄4 in (40.47 m) |
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| Width |
11 ft (3.4 m) |
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| Height |
16 ft 2 1⁄2 in (4.94 m) |
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| Adhesive weight |
540,000 lb (245,000 kg) |
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| Loco weight |
762,000 lb (345,600 kg) |
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| Tender weight |
342,200 lb (155,220 kg) (2/3 load) |
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| Loco & tender weight |
1,250,000 lb (567,000 kg) |
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| Fuel type |
Coal |
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| Fuel capacity |
28 short tons (25.4 t; 25.0 long tons) |
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| Water cap |
25,000 US gal (95,000 l; 21,000 imp gal) |
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Firebox:
• Firegrate area |
150 sq ft (14 m2) |
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| Boiler |
95 in (2,400 mm) |
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| Boiler pressure |
300 lbf/in2 (2.1 MPa) |
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| Heating surface |
5,735 sq ft (533 m2) |
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| • Tubes and flues |
5,035 sq ft (468 m2) |
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| • Firebox |
720 sq ft (67 m2) |
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| Superheater |
Type A |
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| • Heating area |
2,043 sq ft (190 m2) |
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| Cylinders |
4 |
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| Cylinder size |
23.75 in × 32 in (603 mm × 813 mm) |
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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.