The
Missouri Pacific Railroad , commonly abbreviated
MoPac, was one of the
first railroads in the United States west of the
Mississippi River. MoPac was a
Class I railroad growing from dozens of predecessors and mergers, including the
St. Louis, Iron Mountain and Southern Railway (SLIMS),
Texas and Pacific Railway (TP),
Chicago and Eastern Illinois Railroad (C&EI),
St. Louis, Brownsville and Mexico Railway (SLBM),
Kansas, Oklahoma and Gulf Railway (KO&G),
Midland Valley Railroad (MV),
San Antonio, Uvalde and Gulf Railroad (SAU&G),
Gulf Coast Lines (GC),
International-Great Northern Railroad (IGN), New Orleans, Texas and Mexico Railway (NOTM),
Missouri-Illinois Railroad (MI), as well as the small
Central Branch Railway (an early predecessor of MP in Kansas and south central Nebraska), and joint ventures such as the
Alton and Southern Railroad (AS).