The Chicago and Eastern Illinois Railroad was a Class I railroad

Class I railroad

A Class I railroad in the United States and Mexico, or a Class I rail carrier in Canada, is a large freight railroad company, as classified based on operating revenue.Smaller railroads are classified as Class II and Class III...

 that linked Chicago to southern Illinois

Illinois

Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

, St. Louis

St. Louis, Missouri

St. Louis is an independent city on the eastern border of Missouri, United States. With a population of 319,294, it was the 58th-largest U.S. city at the 2010 U.S. Census. The Greater St...

, and Evansville

Evansville, Indiana

Evansville is the third-largest city in the U.S. state of Indiana and the largest city in Southern Indiana. As of the 2010 census, the city had a total population of 117,429. It is the county seat of Vanderburgh County and the regional hub for both Southwestern Indiana and the...

. Founded in 1877, it grew aggressively and stayed relatively strong throughout the Great Depression

Great Depression

The Great Depression was a severe worldwide economic depression in the decade preceding World War II. The timing of the Great Depression varied across nations, but in most countries it started in about 1929 and lasted until the late 1930s or early 1940s...

 and two World Wars before being purchased by the Missouri Pacific Railroad

Missouri Pacific Railroad

The Missouri Pacific Railroad , also known as the 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 , Texas and Pacific...

 (MP, or MoPac) and the Louisville and Nashville Railroad

Louisville and Nashville Railroad

The Louisville and Nashville Railroad was a Class I railroad that operated freight and passenger services in the southeast United States.Chartered by the state of Kentucky in 1850, the L&N, as it was generally known, grew into one of the great success stories of American business...

 (L&N). MoPac merged the C&EI corporate entity in 1976 and was later acquired itself by the Union Pacific Railroad

Union Pacific Railroad

The Union Pacific Railroad , headquartered in Omaha, Nebraska, is the largest railroad network in the United States. James R. Young is president, CEO and Chairman....

.
The Chicago and Eastern Illinois Railroad was organized in 1877 as a consolidation of three others—the Chicago, Danville and Vincennes Railroad

Chicago, Danville and Vincennes Railroad

The Chicago, Danville and Vincennes Railroad was a railroad established in 1865 that served various communities along the eastern border of Illinois...

 (Chicago-Danville, November 1871), the Evansville, Terre Haute and Chicago Railroad (Danville-Terre Haute, October 1871) and the Evansville and Terre Haute (Terre Haute-Evansville, November 1854).