The Chicago and Alton Railroad was a significant railway line in the United States, established in the mid-19th century. It connected the city of Chicago in Illinois to Alton, a city located along the Mississippi River. The railroad played a crucial role in facilitating trade and transportation in the region, contributing to the economic growth of both cities. In 1870, the Chicago and Alton Railroad was officially incorporated, and it became known for its efficient service and modern equipment. Over the years, it underwent various ownership changes and mergers, eventually becoming part of the Union Pacific Railroad in the late 20th century.