The Illinois Railway Museum is the largest railroad museum in the United States. It is located in the Chicago metropolitan area at 7000 Olson Road in Union, Illinois, 55 miles (89 km) northwest of downtown Chicago.

The Illinois Terminal Railroad Company, known as the Illinois Traction System until 1937, was a heavy duty interurban electric railroad with extensive passenger and freight business in central and southern Illinois from 1896 to 1956. When Depression era Illinois Traction was in financial distress and had to reorganize, the Illinois Terminal name was adopted to reflect the line's primary money making role as a freight interchange link to major steam railroads at its terminal ends, Peoria, Danville, and St. Louis. Interurban passenger service slowly was reduced, ending in 1956. Freight operation continued but was hobbled by tight street running in some towns requiring very sharp radius turns. In 1956, ITC was absorbed by a consortium of connecting railroads.