Table 7,,,,,,,
"Number of Aircraft, Vehicles, and Vessels",,,,,,,

Mode,,,1970,1980,1990,1995,1998
Air carriersR,,,"2,679","3,808","6,083","7,411","8,111"
General aviation,,,"  R131,743","R211,045","196,800","182,605","204,710"
Passenger carsa ,,,"89,243,557","121,600,843","133,700,496","128,386,775","131,838,538"
Motorcycles ,,,"2,824,098","5,693,940","4,259,462","3,897,191","3,879,450"
"Other 2-axle, ",,,,,,,
4-tire vehicles,,,"14,210,591","27,875,934","48,274,555","65,738,322","71,330,205"
Trucks: Single-unit,,,"3,681,405","4,373,784","4,486,981","5,023,670","5,734,925"
,Combination,,"905,082","1,416,869","1,708,895","1,695,751","1,997,305"
Busesb,,,"377,562","528,789","626,987","685,503","715,540"
Passenger rail: ,,,,,,,
,Amtrak-Cars,, N,"2,128","1,863","1,722","1,962"
,,Locomotives,N,419,318,313,345
,Commuter railcars  ,,,,,,
,,and locomotives,N,"4,500","4,415","4,565","P4,907"
,Transitc,,"10,548","10,654","11,332","11,156","11,506"
Class I rail:,,,,,,,
,Freight cars,,"1,423,921","1,168,114","658,902","583,486","575,604"
,Locomotives,,"27,077","28,094","18,835","18,812","20,261"
Other freight cars,,,"360,260","542,713","553,359","635,441","740,063"
Nonself-propelled ,,,"19,377","31,662","31,209","31,360","33,509"
"vesselsd,e",,,,,,,
"Self-propelled vesselsd,e",,,"6,455","7,126","8,236","8,281","8,523"
Oceangoing shipse,,,,,,,
"(1,000 gross tons ",,,,,,,
and over),,,"1,579",864,636,509,470
Recreational boats,,,"7,400,000","8,577,857","10,996,253","11,734,710","12,565,930"

"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.""  """,,,,,,,
"b Includes municipally owned transit, commercial, federal, and school buses.  "
c Includes light and heavy rail only.  
"d See glossary, page 29.  "
e U.S. flag vessels. 
Key: N = data do not exist; P = preliminary; R = revised.

"Source: U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 2000 (Washington, DC: In press), table 1-9."