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UNIT TRAINS :  freight train composed of cars carrying a single type of commodity that are all bound for the same destination. By hauling only one kind of freight for one destination, a unit train does not Head to switch cars at various intermediate junctions and so can make nonstop runs between two terminals. This reduces not only the shipping time but also the cost. The unit train was introduced by American railroad companies in the 1950s so that they could offer lower shipping rates and thereby make their freight service more marketable.