Union Pacific 4023

Specifications
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	Locomotive: 72 ft 5+1⁄2 in (22.09 m); Overall: 117 ft 7 in (35.84 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	545,200 lb (247,000 kg)
Loco weight	772,250 lb (350,300 kg)
Tender weight	436,500 lb (197,990 kg)
Total weight	1,208,750 lb (548,300 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:
• Grate area	150 sq ft (14 m2)
Boiler	95 in (2,400 mm)
Boiler pressure	300 lbf/in2 (2.1 MPa)
Heating surface:
• Firebox	720 sq ft (67 m2)
• Tubes and flues	5,035 sq ft (468 m2)
• Total surface	5,735 sq ft (533 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
Type and origin
Power type	Steam
Builder	American Locomotive Company (Schenectady Works)
Serial number	72780
Build date	November 1944
Rebuild date	1957

Union Pacific 4023
Union Pacific 4023
	No. 4023 in its current display site in 2007
Power type
Type and origin
Power type	Steam
Builder	American Locomotive Company (Schenectady Works)
Serial number	72780
Build date	November 1944
Rebuild date	1957
Configuration:;
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	Locomotive: 72 ft 5+1⁄2 in (22.09 m); Overall: 117 ft 7 in (35.84 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	545,200 lb (247,000 kg)
Loco weight	772,250 lb (350,300 kg)
Tender weight	436,500 lb (197,990 kg)
Total weight	1,208,750 lb (548,300 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:
• Grate area	150 sq ft (14 m2)
Boiler	95 in (2,400 mm)
Boiler pressure	300 lbf/in2 (2.1 MPa)
Heating surface:
• Firebox	720 sq ft (67 m2)
• Tubes and flues	5,035 sq ft (468 m2)
• Total surface	5,735 sq ft (533 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)
Maximum speed
Performance figures
Maximum speed	80 mph (130 km/h)
Power output	7,000 hp (5,200 kW) @ Cylinder
Tractive effort	135,375 lbf (602.18 kN)
Factor of adh.	4.02
Operators
Career
Operators	Union Pacific Railroad
Class	4884-2
Numbers	UP 4023
Last run	1959
Retired	1962
Preserved	1963
Restored	1974 (cosmetically)
Current owner	City of South Omaha, Nebraska
Disposition	On static display

Union Pacific 4023 is a 4000 class 4-8-8-4 "Big Boy" type steam locomotive, preserved at Kenefick Park in South Omaha, Nebraska. Built in November 1944 by the American Locomotive Company's Schenectady Works, No. 4023 is one of eight surviving Big Boys and the only one that is part of the class' second group built in 1944, as all seven of the other survivors were part of the first group built in 1941.