Big Boy No. 4014

Union Pacific Railroad is undertaking the movement and restoration of one of the world’s largest steam locomotives – the Big Boy No. 4014.

Twenty-five Big Boys were built exclusively for Union Pacific Railroad, the first of which was delivered in 1941. The locomotives were 132 feet long and weighed 1.2 million pounds. Because of their great length, the frames of the Big Boys were "hinged," or articulated, to allow them to negotiate curves. They had a 4-8-8-4 wheel arrangement, which meant they had four wheels on the leading set of "pilot" wheels which guided the engine, eight drivers, another set of eight drivers, and four wheels following which supported the rear of the locomotive. The massive engines normally operated between Ogden, Utah, and Cheyenne, Wyo.

Eight of the Big Boys were donated for public display in various cities around the country. They can be found in Pomona, Calif.; St. Louis, Mo.; Dallas, Texas; Omaha, Neb.; Denver, Colo.; Scranton, Penn.; Green Bay, Wis.; and Cheyenne, Wyo.

Big Boy No. 4014 was delivered to Union Pacific in December 1941. The locomotive was retired in December 1961, having traveled 1,031,205 miles in its 20 years in service.

No. 4014 is expected to move in Spring 2014  from Colton, Calif., to Cheyenne, Wyo., where it will undergo restoration that is anticipated to take three to five years.

Dare to compare ...

How does No. 4014 compare to a diesel locomotive ... or a Boeing 747? Take a look!

<ul><li><a href="/up/aboutup/special_trains/steam/attachments/4014_infographic.pdf">Print from a PDF</a></li></ul>

Vital Statistics
Tender Type: 14-wheeled
Water Capacity: 24,000 gallons
Fuel: Coal**
56,000 lbs.
Gauge of Track: 4 ft. 8-1/2 in.
Cylinder: Diameter: 23 3/4 in.
Stroke: 32 in.
Driving Wheel Diameter: 68 in.
Boiler: Outside Diameter: 106 9/16 in.
Pressure: 300 lbs.
Fire Box: Length: 235 1/32 in.
Width: 96 3/16 in.
Tubes: 2-1/4 in. Diameter: 75 x 22 ft. 0 in.
4 in. Diameter: 184
Wheel Base: Driving: 47 ft. 3 in.
Engine: 72 ft. 5 1/2 in.
Engine & Tender: 132 ft. 9 7/8 in.
Weight in Working Order,
Leading:   97,000
Driving:    540,000
Trailing:   125,000
Engine:    762,000
Tender:    427,500
Evaporating Surfaces,
Square Feet:
Tubes: 967
Flues: 4,218
Fire Box: 593
Circulators: 111
Total: 5,889
Superheating Surface,
Square Feet:
Grate Area: 150
Maximum Tractive Power: 135,375 lbs.
Factor of Adhesion: 4.00
**Current configuration. Plans call for a conversion to No. 5 Oil


Next Stops

4/28 10:30 a.m. PT
Canyon, Calif.

4/28 12:30 p.m. PT
Victorville, Calif.

4/28 3:15 p.m. PT
Barstow, Calif.

4/28 5:30 p.m. PT
Yermo, Calif.

4/29 12:30 p.m. PT
Kelso, Calif.

4/29 4:15 p.m. PT
Jean, Nev.

4/29 6:15 p.m. PT
Las Vegas, Nev.

5/1 9:15 a.m. PT
Moapa, Nev.

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