Athearn 25741 N Scale 4-6-6-4 Challenger w/Oil Tender Union Pacific UP 3985 DCC & Sound ORPro Treal Aluminum 7075 Front C

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Athearn 25741 N Scale 4-6-6-4 Challenger w/Oil Tender Union Pacific UP 3985 DCC & Sound ORPro Treal Aluminum 7075 Front CAthearn 25741 N Scale 4 6 6 4 Challenger w Oil Tender Union Pacific UP 3985 DCC & Sound The name "Challenger" was given to steam locomotives with a 4 6 6 4 wheel arrangement. This means that they have four wheels in the leading pilot truck, which helps guide the locomotive into curves, two sets of six driving wheels, and finally four trailing wheels, which support the rear of the engine and its massive firebox. Each set of six driving wheels is driven