Union Pacific Big Boy - Wikipedia
WEBThe 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.
4-8-8-4 - Wikipedia
WEB4-8-8-4. A Big Boy locomotive. This example is Union Pacific 4014. A 4-8-8-4 in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with a four-wheel leading truck, two sets of eight driving wheels, and a …
The 4-8-8-4 "Big Boy" Locomotive: UP's Legendary Behemoth
WEBAug 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 4-8-8-4 "Big Boy" Locomotives in the USA
WEBUnion 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
WEBDec 20, 2016 · What makes the Big Boy unique is that even with its massive size and colossal power, it was in regular service for nearly 20 years—it was not an experimental train, and it was not limited to a small section of track. The Big Boy was also not a Mallet-type locomotive.
Big Boy | Steam Engine, Union Pacific, 4-8-8-4 | Britannica
WEBSep 10, 2024 · The Big Boy locomotives had an articulated design; the frame of the front engine was hinge-connected to the rear engine under a single boiler. The wheel arrangement was designated 4-8-8-4—i.e., a set of 4 pilot wheels led a set of 8 coupled driving wheels, which were compounded by another set …
Union Pacific 4014 - Wikipedia
WEBUnion Pacific 4014 is a steam locomotive owned and operated by the Union Pacific (UP) as part of its heritage fleet. It is a four-cylinder simple articulated 4-8-8-4 "Big Boy" type built in 1941 by the American Locomotive Company (ALCO) at its Schenectady Locomotive Works. It was assigned to haul heavy freight trains in the Wasatch mountain range.
Steam locomotive profile: 4-8-8-4 Big Boy | Classic Trains …
WEBJun 12, 2006 · In collaboration with the Alco, Union Pacific set about designing what would be (together with the C&O’s 2-6-6-6 Allegheny) the largest steam locomotive ever built: the 4-8-8-4. Union Pacific Big Boy glides eastward down Sherman Hill a mile from the yard limits at Cheyenne, Wyo., in August 1952.
4-8-8-4 "Big Boy" Locomotives in the USA
WEBThe 4-8-8-4 wheel arrangment was unique to both the United States and to the Union Pacific Railroad. No other railroad and no other country made locomotives anything like these. Many consider the 4-8-8-4s or "Big Boys" to be the largest steam locomotives ever built in the entire world.
UP: UP No. 4014 - The Big Boy - Union Pacific
WEBThey 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.