Athearn Genesis G1030 HO Scale 4-6-6-4 Challenger w/Coal Tender Union Pacific UP 3911 DC Passenger - Obs Width: 202mm (7

Width: 202mm (7

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Athearn Genesis G19352 HO Scale F7A Western Maryland Circus WM 51

Athearn Genesis G1030 HO Scale 4-6-6-4 Challenger w/Coal Tender Union Pacific UP 3911 DC Passenger - Obs Width: 202mm (7Athearn 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