Athearn Genesis G1027 HO Scale 4-6-6-4 Challenger w/Oil Tender Union Pacific UP 3939 DC NYS&W It's part of the Cornerstone

It's part of the Cornerstone Engineered Bridge System and is designed to be compatible with system abutments and bridge piers

They include a machined reservoir shock cap for realistic scale looks

The model features a winding key

real-life mechanical principles which the builder can observe and appreciate both while building the model and while watching it run after it's been finished

High-quality CNC machined aluminum 24mm wheel wrench included

Athearn Genesis G1027 HO Scale 4-6-6-4 Challenger w/Oil Tender Union Pacific UP 3939 DC NYS&W It's part of the CornerstoneAthearn Genesis G1027 HO Scale 4 6 6 4 Challenger w Oil Tender Union Pacific UP 3939 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