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.

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 …

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.

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.

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...

Jan 9, 2024 · Railroading Heritage of Midwest America got an early Christmas gift in December when new flue tubes and stay bolts arrived for Union Pacific 4-6-6-4 3985 and 2-10-2 5511, both currently being restored in Silvis, Ill.

Oct 1, 2008 · Union Pacific 3985 is a four-cylinder simple 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. No. 3985 is one of only two Challengers still in existence and the only one to have operated in excursion service.

Oct 27, 2022 · CHEYENNE – The Union Pacific steam crew has been busy preparing the Challenger No. 3985, along with the TTT-6 steam locomotive No. 5511 and Centennial diesel locomotive No. 6936, for delivery to...

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.