1. Alfred, D., Chandler, Jr.: The Visible Hand: The Managerial Revolution in American Business, pp. 81–121 (1977)
2. America’s First Trains. URL: http://Mikes.Railhistory.Railfan.Net/R013.Html
3. Association of American Railroads: How Intermodal Reinvented Freight Rail. URL: https://www.aar.org/article/how-intermodal-reinvented-freight-rail
4. Association of American Railroads: Freight Rail in Your State. URL: https://www.aar.org/data-center/railroads-states/
5. Association of American Railroads: Freight Rail & Intermodal. URL: https://www.aar.org/issue/freight-rail-intermodal/