Union Pacific 3985 is a four-cylinder articulated 4-6-6-4 "Challenger"-type steam locomotive built in July 1943 by the American Locomotive Company (ALCO) of Schenectady, New York, for the Union Pacific Railroad.

Union Pacific (UP) #3985 was one of 105 4-6-6-4 Challenger type locomotives owned and operated UP. Classified as a 4664-4 by the railroad, the locomotive was built by the American Locomotive Company in July 1943 with builder’s number 70174.

Jan 6, 2023 · Union Pacific 3985, also known as the “Challenger”, is a four-cylinder simple articulated 4-6-6-4 “Challenger”-type steam locomotive built in July 1943 by the ALCO of Schenectady, New York, for the Union Pacific Railroad.

It is one of 105 Challengers built for Union Pacific between 1936 and 1943 and was, for many years, the only operating engine of its class in the world – the largest and most powerful operating steam locomotive. That title has transitioned to Big Boy …

Two Union Pacific Challengers survive. The most notable is Union Pacific No. 3985, which was restored by the Union Pacific in 1981, then operated in excursion service as part of its heritage fleet program.

Oct 26, 2019 · Union Pacific's steam locomotive #3985 is the largest operating steam locomotive in the world. This 4-6-6-4 locomotive, built in 1943 still runs today as part of the railroad's public relations program.

Nov 7, 2022 · Union Pacific Challenger 3985 depicts the History of Union Pacific Challenger 3985, the then world's largest operating Steam Locomotive at the time. Over the years, this video & another...

Throughout 2023 our priority will be working on the #3985, #5511 and #4014 tender, additionally we have been working with NRE to perform a detailed inspection of the DDX Centennial locomotive #6936 for its eventual return to operation.

Union Pacific Railroad No. 3985, also known as 'The Challenger', is a 4664-4 class 4-6-6-4 "Challenger" type articulated steam locomotive built by the American Locomotive Company (ALCO) in July 1943.

Jun 13, 2022 · Before the renovation of UP #844 and #4014 Big Boy, UP #3985 was the largest operating steam locomotive in the world. Built specifically to take on long, steep grades , the #3985 Challenger was designed to pull freight without the benefit of helper engines.