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.

UP 4884 leads 2 other units across a soybean field just north of Rowesville. UP 4884 continues to roll alongside US78 and and beautiful fall colors on its way north. UP's Memphis (TN) to Delores (CA) auto multilevel holding in Ginny Yard on the UP Dallas Sub, just east of Tower 55. Eastbound on UP Huntington Sub.

Dec 20, 2016 · The Union Pacific Big Boy was one of the largest and heaviest steam locomotives ever built. Weighing over 1,189,000 lb (539,000 kg), the engine produced 6,290 hp (4,690 kW) and could pull over 100 cars.

Union Pacific senior manager of Heritage Operations Ed Dickens Jr. said in 2016 that the 4-8-8-4 series originally was to have been called "Wasatch". After a never-identified UP worker wrote "Big Boy" on one of the cylinders, that nickname stuck.

Feb 25, 2025 · 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.

Jun 12, 2006 · Union Pacific Big Boy glides eastward down Sherman Hill a mile from the yard limits at Cheyenne, Wyo., in August 1952. Union Pacific 4-8-8-4 No. 4023 prepares to depart Cheyenne, Wyo., with a westward freight in May 1954. It …

The 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 …

The "Big Boy" unit leads a westbound grain train of FXE hoppers on the Clinton sub. Please Log in to leave a Comment. Link to this page: http://www.rrpicturearchives.net/showPicture.aspx?id=5878943.

Apr 23, 2014 · The purpose of the Union Pacific Historical Society is to gather, preserve, and disseminate historical photos, documents, and information relating to the employees, management, equipment, facilities, traffic, and operations of the Union Pacific Railroad including its predecessor and subsidiary lines for the benefit of our members and the public.

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.