Labor intensive By Angela Cotey | June 26, 2025 | Last updated on August 7, 2025 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Labor intensive Hundred-pound sacks of flour are stacked in a single-sheathed Rock Island boxcar at Minneapolis in 1939. The paper lining helps protect the bags. John Vachon, Library of Congress photo