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Union Pacific 3967

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Union Pacific 3967
Type and origin
Power typeSteam
DesignerOtto Jabelmann
BuilderAmerican Locomotive Company (ALCO)
Build date1942
Specifications
Configuration:
 • Whyte4-6-6-4
 • UIC(2′C)C2′ h4g
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.69 in (1,753 mm)
Wheelbase60 ft 4+1⁄2 in (18.402 m) Engine
121 ft 10+7⁄8 in (37.157 m) Engine + tender
Adhesive weight403,700 lb (183,115 kg)
Loco weight627,000 lb (284,000 kg)
Tender weight436,500 lb (198,000 kg)
Total weight1,063,500 lb (482,400 kg)
Fuel typeCoal, oil
Fuel capacity32 short tons (29 t; 29 long tons)
Water cap.25,000 US gal (95,000 L; 21,000 imp gal)
Firebox:
 • Grate area132 sq ft (12 m)
Boiler94 in (2,400 mm)
Boiler pressure280 lbf/in (1.93 MPa)
Heating surface:
 • Firebox602 sq ft (55.9 m)
 • Tubes527 sq ft (49.0 m)
 • Flues3,687 sq ft (342.5 m)
 • Total surface4,795 sq ft (445.5 m)
Superheater:
 • Heating area2,162 sq ft (200.9 m)
CylindersFour
Cylinder size21 in × 32 in (533 mm × 813 mm)
Performance figures
Maximum speed70 mph (110 km/h)
Tractive effort97,352 lbf (433.04 kN)
Factor of adh.4.15
Career
OperatorsUnion Pacific Railroad
Class4664-3
DispositionScrapped

Union Pacific 3967 was a 4-6-6-4 Challenger Built by the American Locomotive Company in 1942 for the Union Pacific Railroad. The Engine became popular when it became the first Union Pacific Excursion Star, after it pulled an excursion for the Rocky Mountain Railroad Club from Denver, Colorado to Laramie, Wyoming.

Further reading

  1. Wright (1942), p. 413