"TABLE 2-8  Domestic Freight Ton-Miles by Mode: 2001
",,,,,
,Ton-miles,Percent,,,
Air,13,0.3,,,
Truck,"1,260",29.1,,,
Railroad,"1,599",36.9,,,
Water,622,14.3,,,
Oil and natural gas pipeline,843,19.4,,,
Total,"4,337",100.0,,,
"
SOURCES:  Air, oil pipeline, and water—U.S. Department of Transportation (USDOT), Bureau of Transportation Statistics (BTS), National Transportation Statistics 2002, table 1-44 revised, available at http://www.bts.gov/, as of October 2003.  Truck, rail, natural gas pipeline—USDOT, BTS, calculations based on data from various sources as follows:  Truck—USDOT, BTS, Transportation Statistics Annual Report 2000 (Washington, DC: 2001), p. 124, table 2; US International Trade and Freight Transportation Trends (Washington, DC: 2003), figure 14; USDOT, BTS, Martime Trade and Transportation 2002 (Washington, DC: 2002), table 1-20; and USDOT, Federal Highway Administration, Highway Statistics 2001 (Washington DC: 2002), table VM-1. Rail—Surface Transportation Board, Carload Waybill Sample; Transport Canada, Transportation in Canada, Addendum (Ottawa, Ontario: Annual issues), table A6-10; and Association of American Railroads, Railroad Facts (Washington, DC: 1991-2001 issues), p. 36.",,,,,
"Natural gas pipeline—U.S. Department of Energy (DOE), Energy Information Administration (EIA), Annual Energy Review 2001 (Washington, DC: 2002), table 6.5, and DOE, EIA, International Energy Annual 2001 (Washington, DC: 2003), table C-1. ",,,,,