U.S. railroads engage in all-out effort. In December, 1941, two weeks after America entered the war, this U.S.

U.S. railroads engage in all-out effort. In December, 1941, two weeks after America entered the war, this U.S. railroad car, loaded with American soldiers, was part of a troop train destined for a Pacific Coast embarkation port. U.S. railroads moved 4,500,000 troops in the first five months of 1942 and now transport over a million troops every month. More than half of all U.S. passenger cars are in military service.