EVB2938375: Central Pacific Railroad's Bloomer Cut was 800 feet long and had sixty-three foot high walls. It was excavated with dynamite in the late 1860s during the construction of the Transcontinental Railroad in the Sierra Nevada mountains of California. Photo by Alfred A. Hart c. 1867. LC-DIG-stereo-1s00453_CROP / Bridgeman Images
EVB2945252: U.S. MP waves on a 'Red Ball Express' motor convoy near Alencon, France, Sept. 5, 1944. While Atlantic ports and French railroads were repaired, French highways were commandeered for military vehicles from Aug. 25, 1944 until Nov. 16, 1944. African American soldiers loaded and drove 50% of trucks of the vital supply line / Bridgeman Images