1. Rail vs. Truck Fuel Efficiency;Abacus Technology Corporation;Report for the Federal Railroad Administration, DOT/FRA/RRP- 91/2,1991
2. The Maintenance Council;American Trucking Associations,1987
3. Don't idle your profits away!;Argonne National Laboratory,1986
4. Key commodities in rail/truck competition;Association of American Railroads,1989
5. Railroad Facts 1992;Association of American Railroads,1992