Homefront supply line By Angela Cotey | August 19, 2016 | 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 Railroads were the primary means of moving men and materiel within the United States during World War II. Here a freight conductor walks beside flatcars loaded with M3 Lee tanks at an unknown location. U.S. Army Signal Corps photo