Illinois Maintenance Company, formerly part of Insull Utilities Investment Inc. See also Green Mountain Cog Railway Manitou and Pike's Peak Railway Mount Washington Cog Railway Quincy and Torch Lake Cog Railway Cargo Sous Terrain The Boring Company References External links Chicago Tunnel Company Railroad Home Page Frédéric Delaitre's Lost Subways History of Chicago Railroads in the Chicago metropolitan area 2 ft gauge railways in the United States Narrow gauge railroads in Illinois Railroad tunnels in Illinois Defunct Illinois railroads Tunnels completed in 1906 Transportation buildings and structures in Cook County, Illinois 1906 establishments in Illinois Underground railways