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Union Pacific Challenger type 4-6+6-4 steam locomotive # 3… | Flickr
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Locomotive profile: 4-6-6-4 challenger type steam locomotive4-6-6-4 "challenger" locomotives in the usa Challenger originalUnion pacific #3985 challenger steam locomotive at pacific….
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Challenger locomotiveUnion pacific challenger steam locomotive 3977 Western pacific 4-6-6-4 challenger type steam locomotive. …Fs: mth premier great northern 4-6-6-4 z-6 challenger steam engine 20.
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