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unit train

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noun
a freight train of uniform consist that remains coupled, carrying a bulk commodity, as coal or wheat, to a specific destination and that after unloading returns to the point of origin ready for another load.
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Which of the following words means “to make a crackling sound; crackle”?
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Origin of unit train

First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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