NOTES: Miscellaneous mixed shipments is mostly intermodal traffic. Some intermodal traffic is included in commodity specific categories as well.
SOURCES: 2003—AAR, Railroad Facts 2004 (Washington, DC: 2004), pp. 25 and 29. 1993—U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, calculations based on AAR, Railroad Ten-Year Trends 1990–1999 (Washngton, DC: 2000).