| Union Pacific 9000-series |
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The prototype, UP 9000, as preserved at the Los Angeles County Fairplex in Pomona, California. |
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| Specifications |
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Configuration:
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| • Whyte | 4-12-2 |
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| • UIC | 2′F1′ h3g |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) |
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| Driver dia. | 67 in (1,702 mm) |
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| Wheelbase | Loco & tender: 91.50 ft (27.89 m) |
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| Length | 102 ft 7 in (31.27 m) |
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| Axle load | 59,000 lb (26,762 kg; 27 t) |
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| Adhesive weight | 354,000 lb (160,572 kg; 161 t) |
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| Loco weight | 496,500 lb (225,209 kg; 225 t) |
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| Tender weight | 310,599 lb (140,885 kg; 141 t) |
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| Total weight | 807,099 lb (366,094 kg; 366 t) |
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| Fuel type | Coal |
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| Fuel capacity | 44,000 lb (19,958 kg; 20 t) |
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| Water cap. | 18,000 US gallons (68,000 L; 15,000 imp gal) |
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| Firebox: | |
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| • Grate area | 108.25 sq ft (10.057 m2) |
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| Boiler | 92 in (2,337 mm) |
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| Boiler pressure | 220 lbf/in2 (1.52 MPa) |
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| Heating surface: | |
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| • Firebox | 591 sq ft (54.9 m2) |
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Superheater:
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| • Heating area | 2,560 sq ft (238 m2) |
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| Cylinders | Three, two outside, one inside |
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| Cylinder size | - Outside (2): 27 in × 32 in (686 mm × 813 mm);
- Inside (1): 27 in × 31 in (686 mm × 787 mm)
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| Valve gear | Gresley Conjugated |
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The Union Pacific Railroad 9000 Class was a class of 88 steam locomotives, built by ALCO for the Union Pacific between 1926 and 1930.
