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.