At year-end 1967 operated mileage was 9041 miles of road and 13318 miles of track, not including DK&S, NO&LC, T&P and its subsidiaries, C&EI or Missouri-Illinois.
On January 8, 1980 the Missouri Pacific Railroad was purchased by the Union Pacific Railroad. Because of lawsuits filed by various competing railroads, the merger was not approved until September 13, 1982. After the Supreme Court denied a trial from the Southern Pacific, the merger took effect on December 22, 1982, at 2:55 p.m. However, due to outstanding bonds of the Missouri Pacific, the merger with Union Pacific did not become official until January 1, 1997.