Paducah became the site of dry dock facilities for steamboats and towboats, and thus headquarters for many barge companies. Because of its proximity to coalfields further to the east in Kentucky and north in Illinois, Paducah also became an important railway hub for the Illinois Central Railroad. This was the primary north-south railway connecting the industrial cities of Chicago and East St. Louis to the Gulf of Mexico at Gulfport, Mississippi and New Orleans, Louisiana. The Illinois Central system also provided east-west links to the Burlington Northern and the Atchison, Topeka, and Santa Fe Railways (which later merged to become the BNSF Railway).