Table 8,,,,,,
"Number of Aircraft, Railcars, Vehicles, and Vessels",,,,,,

Mode,1970,1980,1990,1999,2000,
Air carriers,"2,679","3,808","6,083","8,228",U,
General aviation,"131,743","211,045","196,800","219,464",U,
Passenger carsa,"89,243,557","121,600,843","133,700,496","132,432,044","133,621,420",
Motorcycles ,"2,824,098","5,693,940","4,259,462","4,152,433","4,346,068",
"Other 2-axle, 
4-tire vehicles",,,,,,
,"14,210,591","27,875,934","48,274,555","75,356,376","79,084,979",
Trucks: Single-unit,,,,,,
,"3,681,405","4,373,784","4,486,981","5,762,864","5,926,030",
Combination,"905,082","1,416,869","1,708,895","2,028,562","2,096,619",
Busesb,"377,562","528,789","626,987","728,777","746,125",
Passenger rail: ,,,,,,
  Amtrak—Cars,N,"2,128","1,863","1,992","1,894",
    Locomotives,N,419,318,329,378
"Commuter railcars
and locomotives",,,,,
,,N,"4,500","4,415","P4,883"
Transitc,"10,548","10,654","11,332","P11,603",U
Class I rail:,,,,,
  Freight cars,"1,423,921","1,168,114","658,902","579,140","560,154"
  Locomotives,"27,077","28,094","18,835","20,256","20,028"
Other freight cars,"360,260","542,713","553,359","789,696","820,642"
Nonself-propelled,,,,,
"vesselsd,e","19,377","31,662","31,209","33,387",U
"Self-propelled vesselsd,e",,,,,
,"6,455","7,126","8,236","8,379",U
"Oceangoing shipse (1,000 gross tons and over) ",,,,,
,,,,,
,"1,579",864,636,463,447
,,,,,
Recreational boatsf,"7,400,000","8,577,857","10,996,253","12,738,271","12,782,143"

"a In July 1997, the U.S. Department of Transportation, Federal Highway Administration, reassigned some vehicles from “passenger car” to “other 2-axle, 4-tire.”",,,,,
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"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 do not exist; P = preliminary; U = unavailable.,,,,,
"Source: Various sources, as cited in U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 2001, table 1-9, available Spring 2002 at www.bts.gov, or email to answers@bts.gov.",,,,,
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