The Chicago Aurora and Elgin Railroad (CA&E), known colloquially as the "Roarin' Elgin" or the "Great Third Rail", was an interurban railroad that operated passenger and freight service on its line between Chicago and Aurora, Batavia, Geneva, St. Charles, and Elgin, Illinois. The railroad also operated a small branch to Mt. Carmel Cemetery in Hillside and owned a branch line to Westchester.
Wounded by the increased use of automobiles after World War II, the CA&E abruptly ended passenger service in 1957. Freight service was suspended in 1959, and the railroad was officially abandoned in 1961. Most of the right-of-way has since been converted to the Illinois Prairie Path rail trail.