Public domain
Chicago, Illinois. Retarder operator in his tower at the hump in the Chicago and Northwestern classification yard
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineChicago, Illinois. Retarder operator in his tower at the hump in the Chicago and Northwestern classification yard. 1942-01-01. Delano, Jack. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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