Southern Pacific Transportation Company
The Union Pacific Corporation has a portfolio of acquiring the Missouri Pacific Railroad which included the Missouri–Kansas–Texas Railroad, the Chicago and North Western Transportation Company, the Western Pacific Railroad, the Denver and Rio Grande Western Railroad, the St. Louis Southwestern Railway, the SPCSL Corporation, and the Southern Pacific Transportation Company. All railroads not including the Southern Pacific Transportation Company were merged into the previous form of the Union Pacific Railroad. As part of the UP-SP merger which included the merging of the Denver and Rio Grande Western Railroad, the St. Louis Southwestern Railway and the SPCSL Corporation into the previous form of the Union Pacific Railroad, the Union Pacific Corporation merged the previous form of the Union Pacific Railroad into the Southern Pacific Transportation Company and renamed the Southern Pacific Transportation Company to the current form of the Union Pacific Railroad.