Big Boy reference · Eight survivors

Where Are the Eight Surviving Big Boys?

ALCO Schenectady built 25 Union Pacific Big Boys between 1941 and 1944 — the largest successful steam locomotives ever produced. Eight survived the scrappers. Only one of those (4014) runs under steam today. Here's where you can see the other seven.

Class specs

Wheel arrangement
4-8-8-4 (the only 4-8-8-4 ever built)
Builder
ALCO Schenectady, NY · 1941 (20) + 1944 (5)
Length over couplers
132 ft 9¼ in
Weight (engine + tender loaded)
1,208,750 lb — the famous "1.2 million pounds"
Tractive effort
135,375 lbf
Driving wheels
68 in diameter, 16 total
Horsepower
6,290 @ 41 mph
Original fuel
Coal — 4014 converted to No. 5 fuel oil during 2014-19 restoration

The eight survivors

  • No. 4004

    Static display

    Holliday Park

    Cheyenne, WY

    Outdoor pedestal display in 4014's home town. The "other" Cheyenne Big Boy.

  • No. 4005

    Static display

    Forney Transportation Museum

    Denver, CO

    Indoor display, well-preserved. Pair with a Cheyenne→Denver railfan trip.

  • No. 4006

    Static display

    National Museum of Transportation

    St Louis, MO

    Indoor and accessible — also home to Frisco 1522 and 60+ other locomotives.

  • No. 4012

    Static display

    Steamtown National Historic Site

    Scranton, PA

    Will be paired with 4014 on June 15-16, 2026 — the only time two Big Boys are seen together in 2026. Worth planning a Scranton trip around.

  • No. 4014

    Operating

    Union Pacific Heritage Fleet (currently on 2026 tour)

    Cheyenne, WY

    The only operational Big Boy. Restored 2014-19 and converted from coal to No. 5 fuel oil during that rebuild.

  • No. 4017

    Static display

    National Railroad Museum

    Green Bay, WI

    Indoor display. The Wisconsin Big Boy.

  • No. 4018

    Static display

    Museum of the American Railroad

    Frisco, TX

    Currently outdoor; museum has 2024 plans to move it indoors.

  • No. 4023

    Static display

    Kenefick Park

    Omaha, NE

    Outdoor pedestal display next to UP's historic headquarters.

Follow 4014's tour

Every confirmed stop on the 2026 coast-to-coast tour with addresses, times, and directions.

View the 2026 schedule →