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Here are some very striking historical images at Mashable, documenting that in Iowa, during the war, Rosie did some locomotive maintenance on the side.

With enlisted men heading overseas, railroad companies turned to women to keep their overtaxed locomotives maintained and running smoothly. By 1945, some 116,000 women were working on railroads.

In April 1943, Office of War Information photographer Jack Delano photographed the women of the Chicago & North Western Railroad roundhouse in Clinton, Iowa, as they kept the hulking engines cleaned, lubricated and ready to support the war effort.