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Painting with light c. 1943. Delano, Jack-Indiana Harbor Belt RR, switchman demonstrating signal with a "fusee" - used at twilight and dawn - when visibility is poor-This signal means "back up" Calumet City, Ill 1943 Jan

January 1943. Calumet City, Ill. "This signal means stop" 4x5 Kodachrome transparency by Jack Delano.