Union Pacific Big Boy - Wikipedia
The Union Pacific Big Boy is a type of simple articulated 4-8-8-4 steam locomotive manufactured by the American Locomotive Company (ALCO) between 1941 and 1944 and operated by the Union Pacific Railroad in revenue service until 1962.
Union Pacific Big Boy basics and frequently asked questions
Aug 3, 2021 — Union Pacific Big Boy basics Q: Why is a diesel with Big Boy 4014? A: The diesel serves many purposes. Its dynamic braking saves brake shoes. Its power provides a boost that saves on No. 4014 fuel stops. It’s a much-preferred power source in tunnels. And if Big Boy were disabled on the main line, the diesel could still move the train. In
UP: Mighty ‘Big Boy’ Locomotive Reflects Evolution of Rail Technology
Sep 16, 2021 — To grasp the enormity of this historic undertaking one must understand the history of the 4000-class Big Boy steam locomotives. Big Boy UP 4014 completed its 10-state Big Boy 2021 Tour, celebrating railroad heritage and the communities Union Pacific serves.
Union Pacific 4-8-8-4 "Big Boy" Locomotives in the USA
Union Pacific 4-8-8-4 "Big Boy" Locomotives in the USA. During the late 1930s, the Union Pacific often used helpers to move trains from Ogden to Wahsatch.
Union Pacific 4-8-8-4 Big Boy Locomotive - Old Machine Press
Dec 20, 2016 — With its tender, the Big Boy was one of the largest and heaviest steam locomotives ever built. The Big Boy’s design was based closely on the UP’s 4-6-6-4 Challenger that went into service in 1936. However, the Big Boy was larger and heavier than the Challenger and necessitated that UP make many changes to the track between Ogden and Green River.
The 4-8-8-4 "Big Boy" Locomotive: UP's Legendary Behemoth
Aug 25, 2024 — Few steam locomotives compare to Union Pacific's (UP) colossus 4-8-8-4 "Big Boy." It was designed during the zenith of seam technology and earned celebrity status as soon as the first debuted in 1941.
Union Pacific 'Big Boys' - Where are they now? - We ... - We Are …
Feb 11, 2021 — The Union Pacific 'Big Boy' is arguably the most famous locomotive in the USA and is known by railfans across the globe. It remains the most powerful steam locomotive in the world and charts high on the all-time lists of longest and heaviest steam locomotives ever built.
UP: Historic Steam Locomotive Outfitted with Cutting-Edge …
The legendary locomotive was recently outfitted with an updated Positive Train Control (PTC) system, a system designed to stop certain rail incidents before they occur. The new system’s components – computer, GPS satellite and radio antennas – are now entirely housed within Big Boy and its tender.
UP: Full Steam Ahead: World’s Largest Steam Locomotive Returns with ...
Jun 14, 2021 — Twenty-five Big Boys were built exclusively for Union Pacific, the first of which was delivered in 1941 to handle the steep terrain between Cheyenne and Ogden. Of the eight still in existence, No. 4014 is the world's only operating Big Boy.
Union Pacific #4017 “Big Boy” - National Railroad Museum
Union Pacific #4017 “Big Boy”. Weighing in at 1.1 million pounds and measuring nearly half a football field in length, the “Big Boy” locomotives were designed to haul heavy freight for the Union Pacific railroad over the mountainous regions of Utah and Wyoming.
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