Athearn Genesis G1015 HO Scale 4-6-6-4 Challenger w/Coal Tender Union Pacific UP 3938 DC TRRA Adjustable caster angle (3 settings)

Adjustable caster angle (3 settings)

Engine hood opens

Check out those distinctive roof vents added during rebuilding but the original SLCC “taller” style smokejack

Cresson Branches

Athearn Genesis G1015 HO Scale 4-6-6-4 Challenger w/Coal Tender Union Pacific UP 3938 DC TRRA Adjustable caster angle (3 settings)Athearn 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