This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Union Pacific 4012" – news · newspapers · books · scholar · JSTOR(July 2016) (Learn how and when to remove this message)
Union Pacific 4012
"Big Boy" 4012 on static display at Steamtown National Historic Site, August 2023
Type and origin
Power type
Steam
Builder
American Locomotive Company
Serial number
69583
Build date
November 1941
Specifications
Configuration:
• Whyte
4-8-8-4
• UIC
(2′D)D2′ h4
Gauge
4 ft 8+1⁄2 in (1,435 mm)
Leading dia.
36 in (914 mm)
Driver dia.
68 inches (170 cm)
Trailing dia.
42 in (1,067 mm)
Minimum curve
288 ft (88 m) radius/ 20°
Wheelbase
Locomotive: 72 ft 5.5 in (22.09 m)
Overall: 117 ft 7 in (35.84 m)
Length
Locomotive: 85 ft 7.8 in (26.11 m)
Overall: 132 ft 9+7⁄8 in (40.48 m)
Width
11 ft (3.4 m)
Height
16 ft 2+1⁄2 in (4.94 m)
Axle load
67,500 lb (30,617 kilograms)
Adhesive weight
540,000 lb (244,940 kilograms)
Loco weight
762,000 lb (345,637 kilograms)
Tender weight
342,200 lb (155,219 kilograms) (2/3 load)
Total weight
1,250,000 lb (566,990 kilograms)
Tender type
25-C
Fuel type
Coal
Water cap.
24,000 US gal (91,000 L; 20,000 imp gal)
Firebox:
• Grate area
150 sq ft (14 m2)
Boiler
95 in (2,400 mm)
Boiler pressure
300 lbf/in2 (2.1 MPa)
Heating surface:
• Firebox
704 sq ft (65 m2)
• Tubes and flues
5,185 sq ft (482 m2)
• Total surface
5,889 sq ft (547 m2)
Superheater:
• Type
Type E
• Heating area
2,466 sq ft (229 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
5,300–7,000 hp (4,000–5,200 kW) @ 41 mph
Tractive effort
135,375 lbf (602.18 kN)
Factor of adh.
3.99
Career
Operators
Union Pacific Railroad
Class
4884-1
Numbers
4012
First run
1941
Last run
1959
Retired
1962
Restored
May 5, 2021 (cosmetically)
Disposition
On static display at Steamtown National Historic Site Scranton, PA
Union Pacific 4012 is one of eight preserved Union Pacific Big Boy locomotives. Built in November 1941 by the American Locomotive Company (ALCO) of Schenectady, New York, No. 4012 was retired in 1962 and donated to Steamtown, U.S.A, in Bellows Falls, Vermont, and later moved to Steamtown National Historic Site in Scranton, Pennsylvania, where it remains today.
and 18 Related for: Union Pacific 4012 information
UnionPacific4012 is one of eight preserved UnionPacific Big Boy locomotives. Built in November 1941 by the American Locomotive Company (ALCO) of Schenectady...
Retrieved July 27, 2019. "Steamtown National Historic Site's UnionPacific "Big Boy" No. 4012 Removed From Public Display For Cosmetic Restoration and Painting...
see UnionPacific Corporation. There have been four railroads called UnionPacific: UnionPacific Rail Road, UnionPacific Railway, UnionPacific Railroad...
response to the Northern Pacific selecting Tacoma as their western terminus. The SLS&E was later purchased by the Northern Pacific. The Snoqualmie depot...
by the DL&W. Other noteworthy pieces are the popular UnionPacific Big Boy #4012, Canadian Pacific Railway (CP Rail) #2929 (a rare Jubilee 4-4-4), Nickel...
(PDF). The Labrador Boundary Dispute Documents (Report). Vol. VIII. pp. 4012–4013. Retrieved May 9, 2014. The District of Franklin (situated inside of...
"Australia's First 4 Billion Years: Strange Creatures" May 1, 2013 (2013-05-01) 4012(745) After a massive extinction, diverse marsupials came to dominate this...
Clarendon Press. Ennis, Garth (2006). War Stories: Volume 2. Vertigo. ISBN 1-4012-1039-2. Fischer, David Hackett (1989). Albion's Seed: Four British Folkways...
Wildlife Conservation by Sustainable Use. pp. 295–313. doi:10.1007/978-94-011-4012-6_15. ISBN 978-94-010-5773-8. S2CID 168071478. P. A. Lindsey; R. Alexander;...
following issue). Superboy himself joins the Squad to assist in taking out a Pacific Rim crime cartel called the Silicon Dragons. Writer Karl Kesel claims to...
taxa over 40 years in central Europe". Global Change Biology. 28 (13): 3998–4012. doi:10.1111/gcb.16200. PMID 35535680. S2CID 248668146. Chowdbury, Shawan...
International Journal of Information Management. 14 (4): 252–268. doi:10.1016/0268-4012(94)90003-5. Gibb, Forbes; Buchanan, Steven (April 2006). "A framework for...
(July 1, 2005). Batman/Superman/Wonder Woman: Trinity. DC Comics. ISBN 978-1-4012-0187-6. War of the Gods #1 (September 1991). DC Comics. Charles Moulton (w)...
Global Information
