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Norfolk Southern Diesel Tankers?
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It's basically an additional traction motor that's controlled from one of the cab units. The railroads use them for additional pulling/pushing power in yards mostly, especially in hump yards. They're not really the same thing as "B" of "calf" units (which I like better - especially the F7B's and the SW9 "calves") since the slugs don't have a diesel engine inside.
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