|Class I railb,c||207,334||199,798||196,479||191,520||164,822||145,764||119,758||116,626||113,056||110,425||109,332||108,264||105,779||102,128||100,570||99,430||99,250|
KEY: N = data do not exist; R = revised; U = data are not available.
a All public road and street mileage in the 50 states and the District of Columbia. For years prior to 1980, some miles of nonpublic roadways are included. No consistent data on private road mileage are available. Beginning in 1998, approximately 43,000 miles of Bureau of Land Management Roads are excluded.
b Data represent miles 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 miles of track operated.
d Transit system mileage is measured in directional route-miles. A directional route-mile is the mileage in each direction over which public transportation vehicles travel while in revenue service. Directional route-miles 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 26,000 miles of navigable waterways, 10,867 miles 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. Mileage 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 mileage.
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:
1960-2000: Association of American Railroads, Railroad Facts (Washington, DC: 2001), p. 45.
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.
1960-2000: American Gas Association, Gas Facts (Arlington, VA: Annual issues), table 5-2 and similar tables in earlier editions.