Table 9,,,,,
"Number of Aircraft, Railcars, Vehicles, and Vessels",,,,,
Mode,1970,1980,1990,2000,2001
Air carriers,"2,679 ","3,808 ","6,083 ","8,055 ","8,497 "
General aviation,"131,743 ","211,045 ","198,000 ","217,533 ","211,446 "
Passenger carsa,"89,243,557 ","121,600,843 ","133,700,496 ","133,621,420 ","137,633,467"
Motorcycles ,"2,824,098 ","5,693,940 ","4,259,462 ","4,346,068 ","4,903,056"
"Other 2-axle, 
4-tire vehicles","14,210,591 ","27,875,934 ","48,274,555 ","79,084,979 ","84,187,636"
Trucks: Single-unit,"3,681,405 ","4,373,784 ","4,486,981 ","5,926,030 ","5,703,500"
Combination,"905,082 ","1,416,869 ","1,708,895 ","2,096,619 ","2,154,174"
Busesb,"377,562 ","528,789 ","626,987 ","746,125 ","749,548"
Passenger rail: ,,,,,
Amtrak—Cars,N,"2,128 ","1,863 ","1,894 ","2,084 "
Locomotives,N,419 ,318 ,378 ,401 
"Commuter railcars
and locomotives",N,"4,500 ","4,415 ","5,073 ","P5,124"
Transitc,"10,548","10,654 ","11,332 ","12,168 ","P12,084"
Class I rail:,,,,,
Freight cars,"1,423,921 ","1,168,114 ","658,902 ","560,154 ","499,860 "
Locomotives,"27,077 ","28,094 ","18,835 ","20,028 ","19,745 "
Other freight cars,"360,260 ","542,713 ","553,359 ","820,642 ","814,276 "
"Nonself-propelled vessels (barges)d,e","19,377 ","31,662 ","31,209 ","33,152 ","33,042 "
"Self-propelled vesselsd,e","6,455 ","7,126 ","8,236 ","8,202 ","8,546 "
"Oceangoing shipse (1,000 gross tons and over) ","1,579 ",864 ,636 ,454,443
Recreational boatsf,"5,128,345 ","8,577,857 ","10,996,253 ","12,782,143 ","R12,876,346"
"a In July 1997, the USDOT, Federal Highway Administration, reassigned some vehicles, e.g., sport utility vehicles, from “passenger car” to “other 2-axle, 4-tire.”   ",,,,,
"b Includes municipally owned transit, commercial, federal, and school buses.   ",,,,,
c  Includes light and heavy rail only.   ,,,,,
d See glossary.   ,,,,,
e U.S.-flag vessels.   ,,,,,
f Numbered boats.,,,,,
"
Key: N = data are nonexistent; P = preliminary; R = revised.",,,,,
"Sources: All data, except as noted—various sources, as cited in USDOT, BTS, National Transportation Statistics 2002 (Washington, DC: 2002), table 1-11. Air carriers 2001—Aerospace Industries Association, Aerospace Facts & Figures (Washington, DC: 2003/2004), “Active U.S. Air Carrier Fleet.” 2001 Class I rail—Association of American Railroads, Class I Railroad Statistics, available at http://www.aar.org/AboutTheIndustry/AboutTheIndustry.asp, as of Oct. 2002. Passenger rail 2001—Association of American Railroads, Railroad Profiles, available at http://www.aar.org/AboutTheIndustry/RailroadProfiles.asp, as of November 2003",,,,,
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