The 4-6-6-4 Challenger Steam locomotive, Steam trains photography, Locomotive

Locomotive #3985 – Challenger Railroading Heritage of Midwest America

Athearn - The Union Pacific CSA (Challenger Simple Articulated) Challengers were the first 4-6-6-4 steam locomotive built by American Locomotive Company for the Union Pacific Railroad. Two orders of “original” also known

Union Pacific Challenger No. 3985

UP locomotive, engine number 3901, engine type 4-6-6-4 - Photographs - Western History - Denver Public Library Special Collections and Digital Archives Digital Collections

Union Pacific LEGACY 4-6-6-4 Challenger (oil fired) #3983

One of the Delaware & Hudson's big - American-Rails.com

4-6-6-4 Challenger

Northern Pacific Railroad Challenger Steam Engine 5134 4-6-6-4 8x10 Photograph

Sold at Auction: American Locomotive Company / Alco Union Pacific 4-6-6-4 Challenger # 3902 Framed Builders Photograph

Elliott Barber Photography - Challenger at Daybreak UP #3985, a 4-6-6-4 Challenger class steam locomotive, is being readied for it's run into Los Angeles for the Democratic National Convention in August of