May 12, 1917

The St. Louis, Iron Mountain and Southern (StLIM&S) was merged with the Missouri Pacific, which in turn was merged into the Union Pacific in 1982. The Southern Pacific and its Cotton Belt subsidiary (St. Louis-Southwestern) were also merged into the Union Pacific in 1996. The original Cairo and Fulton line operates today as the northbound mainline, while the Southern Pacific tracks operate as the southbound mainline through Arkansas. As a northbound mainline from Texas, the original Cairo and Fulton line began serving as the main artery for the Texas petrochemical industry and also began transporting the products of Arkansas to the northeastern United States.