Railroads became commercially viable in the United States in the 1840s. The building of railroads greatly accelerated during the next decade as they provided the large-scale movement of goods necessary for the Industrial Revolution. By the start of the American Civil War, the American rail system was the largest in the world, with 30,000 miles of track. At the beginning of the war, there were 9,000 miles of track in the South as compared to the 21,000 miles in the North. The South had one-third of the freight cars, one-fifth of the locomotives, one-tenth of the telegraph stations, and one-twenty-fourth of locomotive production of the North. Judging the relative strength of the Northern and Southern rail systems by these numbers alone, however, can be misleading. The Confederacy’s white population of 5.5 million was only 22 percent of the Union’s 18.5 million. The South also compared favorably in the number of people living within fifteen miles, or a day’s journey, of a railroad. In addition, most of the railroads in the Northeastern states were built in the 1840s, while those in the South were built in the 1850s, making the Southern railroad system newer.