Back in the day, farmers used cream cans to ship their cream by train to--of course-- creameries (plants devoted to the distribution of milk products). Every morning when the train passed through small towns, there would be rows of cream cans (usually distinctively painted for easy identification) sitting on the railway platform, only to return empty on the evening train. The milk, which the famers separated from the cream using cream separators, was used by the farm family, with the excess fed to the hogs.
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