Athearn Genesis G1015 HO Scale 4-6-6-4 Challenger w/Coal Tender Union Pacific UP 3938 DC Pan Am Railways Note: Painted body is shown

Note: Painted body is shown in photos for illustrative purposes only

but some were built new

Full-time shaft-driven 4-wheel drive

including thick grass

Prototypically Accurate Window Tinting as Appropriate

Athearn Genesis G1015 HO Scale 4-6-6-4 Challenger w/Coal Tender Union Pacific UP 3938 DC Pan Am Railways Note: Painted body is shownAthearn Genesis G1015 HO Scale 4 6 6 4 Challenger w Coal Tender Union Pacific UP 3938 DC ALCO constructed the first 4 6 6 4 locomotives in the world, numbered 3900 to 3914, for the Union Pacific Railroad in 1936. These huge engines were named the Challenger Simple Articulated, or CSA 1, class. The railroad received 25 near copies, classified as CSA 2, the following year. Unlike compound Mallet engines that crawled along with drag freights, the