Athearn Genesis G1030 HO Scale 4-6-6-4 Challenger w/Coal Tender Union Pacific UP 3911 DC Scale_HOn3 The 4-8-8-4 wheel arrangement combined

The 4-8-8-4 wheel arrangement combined stability and power

Cube-type speaker

2" (pre-glued with inserts)

Used by hobbyists

Athearn Genesis G1030 HO Scale 4-6-6-4 Challenger w/Coal Tender Union Pacific UP 3911 DC Scale_HOn3 The 4-8-8-4 wheel arrangement combinedAthearn Genesis G1030 HO Scale 4 6 6 4 Challenger w Coal Tender Union Pacific UP 3911 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