|Class I railb,c||333,672||321,544||316,202||308,222||265,255||234,584||192,732||187,691||181,946||177,712||175,953||174,234||170,235||164,359||161,852||160,017||194,082|
KEY: N = data do not exist; R = revised; U = data are not available.
a All public road and street kilometers in the 50 states and the District of Columbia. For years prior to 1980, some kilometers of nonpublic roadways are included. No consistent data on private road kilometers are available. Beginning in 1998, approximately 69,200 kilometers of Bureau of Land Management Roads are excluded.
b Data represent kilometers of road owned (aggregate length of road, excluding yard tracks, sidings, and parallel lines).
c Portions of Class I freight railroads, Amtrak, and commuter rail networks share common trackage. Amtrak data represent kilometers of track operated.
d Transit system kilometers is measured in directional route-kilometers. A directional route-kilometer is the kilometer in each direction over which public transportation vehicles travel while in revenue service. Directional route-kilometers are computed with regard to direction of service, but without regard to the number of traffic lanes or rail tracks existing in the right-of-way.
e The St. Lawrence Seaway is not included in this number because 3 of the 5 subsections are solely in Canadian waters, and the others are in international boundary waters. Of the 41,800 kilometers of navigable waterways, 17,500 kilometers are commercially significant shallow-draft inland waterways subject to fuel taxes.
f Includes trunk and gathering lines for crude-oil pipeline.
g Excludes service pipelines. Data not adjusted to common diameter equivalent. Kilometers as of the end of each year. Includes field and gathering, transmission, and distribution mains. See table 1-8 for a more detailed breakout of oil and gas pipeline kilometers.
NOTE: Numbers may differ slightly from previous year's metric tables because a higher precision conversion factor was used. 1.609344 kilometers = 1 mile.
1960-95: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995, FHWA-PL-97-009 (Washington, DC: Annual issues), table HM-212.
1996-98, 2000: Ibid., Highway Statistics (Washington, DC: Annual issues), table HM-20.
1999: Ibid., personal communication, May 2002.
Class I rail:
1960-99: Association of American Railroads, Railroad Facts (Washington, DC: 2000), p. 44.
2000: Ibid., Railroad 10-Year Trends, personal communications, Sept. 19, 2001.
1980: Amtrak, Corporate Planning and Development, personal communication (Washington, DC).
1985-2000: Amtrak, Corporate Planning and Development, Amtrak Annual Report, Statistical Appendix (Washington, DC: Annual issues).
1985-99: U.S. Department of Transportation, Federal Transit Administration, National Transit Database (Washington, DC: Annual issues) table 20 and similar tables in earlier editions.
1960-96: U.S. Army Corps of Engineers, Ohio River Division, Huntington District, Ohio River Navigation System Report, 1996, Commerce on the Ohio River and its Tributaries (Fort Belvoir, VA: 1996), p. 2.
1997-99: Waterborne Commerce Statistics Center Databases, personal communication, Aug. 3, 2001.
1960-99: Eno Transportation Foundation, Inc., Transportation in America, 2000 (Washington, DC: 2001), p. 44.
1960-99: American Gas Association, Gas Facts (Arlington, VA: Annual issues), table 5-2 and similar tables in earlier editions.