1. Cambridge Systematics 2001 Freight Trends, Issues, and Data Needs, presented at the Conference on Data Needs in the Changing World of Logistics and Freight Transportation, Saratoga Springs, NY http://www.dot.state.ny.us/ttss/conference/grenzeback.pdf
2. Cambridge Systematics 2002 Mid-Atlantic Rail Operations Study http://www.i95coalition.org/
3. DeWitt , W. J. Clinger 2001 Intermodal Freight Transportation, Millennium Paper, TRB Committee on Intermodal Freight Transportation (A1B05) National Academy Press http://www.nationalacademies.org/trb/publications/millennium/00061.pdf