Table 1-1. System Mileage Within the United States (Statute miles)

Table 1-1. System Mileage Within the United States (Statute miles)

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  1960 1965 1970 1975 1980 1985 1990 1991 1992 1993 1994 1995 1996 1997 1998
Highwaya   3,545,693 3,689,666 3,730,082 3,838,146 3,859,837 3,863,912 3,866,926 3,883,920 3,901,081 3,905,211 3,906,595 3,912,226 3,919,450 3,944,597 3,948,893
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
Amtrakc   N N N N 24,000 24,000 24,000 25,000 25,000 25,000 25,000 24,000 25,000 25,000 22,000
Transitd                                
Commuter railc   N N N N N 3,574 4,132 4,038 4,013 4,090 4,090 4,160 3,682 4,417 5,172
Heavy rail  N N N N N 1,293 1,351 1,369 1,403 1,452 1,455 1,458 1,478 1,527 1,527
Light rail  N N N N N 384 483 551 558 537 562 568 638 659 676
Navigable channelse   25,000 25,000 26,000 26,000 26,000 26,000 26,000 26,000 26,000 26,000 26,000 26,000 26,000 26,000 26,000
Oil pipelinef   190,944 210,867 218,671 225,889 218,393 213,605 208,752 203,828 199,023 199,023 200,500 R221,600 R177,535 179,873 178,648
Gas pipelineg   630,950 767,520 913,267 979,263 1,051,774 1,118,875 1,206,894 1,225,358 1,253,924 1,251,095 1,257,971 1,262,152 1,276,315 R1,251,199 1,279,714

a All public road and street mileage. For years prior to 1980, some miles of nonpublic roadways are included. No consistent data on private road mileage are available.  
Includes District of Columbia. Beginning in 1996, mileage for Puerto Rico are included. 
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. 

KEY: N = data do not exist; R = revised. 

NOTES: 
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. See the accuracy statement in the appendix for additional details. 

SOURCES:
Air: 
1960-98: Eno Transportation Foundation, Inc., Transportation in America, 1998 (Washington, DC: 1999), p. 64.  
Highway: 
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. 
Amtrak: 
1980: Amtrak, Corporate Planning and Development, personal communication (Washington, DC). 
1985-98: Amtrak, Corporate Planning and Development, Amtrak Annual Report, Statistical Appendix (Washington, DC: Annual issues). 
Transit:
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. 
Navigable channels: 
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.            
Oil pipeline: 
1960-98: Eno Transportation Foundation, Inc., Transportation in America, 1998 (Washington, DC: 1999), p. 64.  
Gas pipeline: 
1960-98: American Gas Association, Gas Facts (Arlington, VA: Annual issues), table 5-2 and similar tables in earlier editions.