|Class I railb,c||333,672||321,544||316,202||308,222||265,255||234,584||192,732||310,172||499,173||803,341||1,292,852||174,234||170,235||164,359||161,852|
a All public road and street mileage. Prior to 1980, some miles of nonpublic roadways are included. No consistent data on private road mileage are available.Includes District of Columbia.
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 main. See table 1-8 for a more detailed breakout of oil and gas pipeline mileage.
KEY: N = data do not exist; R = revised.
Total highway mileage in this table will not match that in tables 1-4 and 1-5 because of a change in the way the U.S. Department of Transportation, Federal Highway Administration (FHWA) creates mileage-based tables derived from the Highway Performance Monitoring System, beginning with the 1997 issue of FHWA's Highway Statistics.
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: Ibid., Highway Statistics (Washington, DC: Annual issues), table HM-12.
Class I rail:
1960-98: Association of American Railroads, Railroad Facts (Washington, DC: 1998), p. 44.
1980: Amtrak, Corporate Planning and Development, personal communication (Washington, DC).
1985-98: Amtrak, Corporate Planning and Development, Statistical Appendix to Amtrak Annual Report (Washington, DC: Annual issues).
U.S. Department of Transportation, Federal Transit Administration, National Transit Database (Washington, DC: Annual issues), table 18 (1996-1997) and table 19 (for 1998) 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.
1997-1998: Waterborne Commerce Statistics Center Databases, personal communication, June 2000.
1960-98: Eno Transportation Foundation, Inc., Transportation in America, 1998 (Washington, DC: 1999), p. 64.
1960-98: American Gas Association, Gas Facts (Arlington, VA : Annual issues), table 5-2 and similar tables in earlier editions.