Traffic control for railroads

THE HISTORY of the United States shows in some degree a direct relationship between the country´s progress and the building of the railroads. One of the railroads´ most outstanding achievements was the phenomenal manner in which they handled more than 90% of all personnel and materials that were moved for military purposes during World War II. One objective of this paper is to show how the centrallized traffic-control system helped the railroads achieve this outstanding performance.