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4-6-6-4 ,

8655 UP Challenger 4-6-6-4, #3977, Museum Version, Two-tone,

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Athearn G97223 HO UP Challenger 4-6-6-4 Steam Locomotive w,

MTH 20-3952-1 - 4-6-6-4 Z-6 Challenger Steam Engine,

Union Pacific 4-6-6-4 “Challenger” 3985. From Mark I Video,

MTH 20-3278-1 O Gauge Great Northern 4-6-6-4 Z-6 Challenger,

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Athearn G97223 HO UP Challenger 4-6-6-4 Steam Locomotive w,

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Union Pacific Challenger - Wikipedia,

Union Pacific 4-6-6-4 ,

Union Pacific 4-6-6-4 ,

Union Pacific 4-6-6-4