NOTE: Miscellaneous mixed shipments is mostly intermodal traffic.
Some intermodal traffic is included in commodity-specific categories
instead.
SOURCES: Association of American Railroads, Railroad Facts (Washington, DC: 2001 and 2002 issues). 1991 data-U.S. Department of Transportation, Bureau of Transportation Statistics, calculations based on Association of American Railroads,
Railroad Ten-Year Trends 1990-1999
(Washington, DC: 2000).