Athearn Genesis G1025 HO Scale 4-6-6-4 Challenger w/Oil Tender Union Pacific UP 3823 DC N Decals Optional Pro-Spec Springs are available

Optional Pro-Spec Springs are available separately

Molded Thermoplastic Polyurethane (TPU) bumpers defend it against damage from drops and bumps

Beginning in 1958

round loading hatches are also common

Ultra-simple Patent-Pending gimbal mode-change switch

Athearn Genesis G1025 HO Scale 4-6-6-4 Challenger w/Oil Tender Union Pacific UP 3823 DC N Decals Optional Pro-Spec Springs are availableAthearn Genesis G1025 HO Scale 4 6 6 4 Challenger w Oil Tender Union Pacific UP 3823 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