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Table 9 - Number of Vehicles, Aircraft, Railcars, and Vessels
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| Highway |
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| Truck, single-unit
2-axle 6-tire or more |
4,373,784 |
4,486,981 |
5,926,030 |
5,650,619 |
| Truck, combination |
1,416,869 |
1,708,895 |
2,096,619 |
2,276,661 |
| Truck, total |
5,790,653 |
6,195,876 |
8,022,649 |
7,927,280 |
| Air |
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| Air carriers |
3,808 |
6,083 |
8,055 |
8,194 |
| Rail |
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| Class I, locomotive |
28,094 |
18,835 |
20,028 |
20,506 |
| Class I, freight cars
(1) |
1,168,114 |
658,902 |
560,154 |
477,751 |
| Nonclass I freight cars
(1) |
102,161 |
103,527 |
132,448 |
130,590 |
| Railcar companies and
shippers freight cars (1) |
440,552 |
449,832 |
688,194 |
691,329 |
| Water |
38,788 |
39,445 |
41,354 |
41,002 |
| Nonself-propelled
vessels (2) |
31,662 |
31,209 |
33,152 |
32,381 |
| Self-propelled vessels
(3) |
7,126 |
8,236 |
8,202 |
8,621 |
| Oceangoing
steam and motor ships (4) |
864 |
636 |
454 |
426 |
(1) Beginning with 2001 data, Canadian-owned U.S. railroads are
excluded. This accounted for about
47,000 cars in 2000.
(2) Nonself-propelled vessels include dry-cargo barges, tank barges, and
railroad-car floats.
(3) Self-propelled vessels include dry cargo, passenger, off-shore support,
tankers, and towboats.
(4) 1,000 gross tons and over.
SOURCE: Various sources, as cited in U.S. Department
of Transportation, Research and Innovative Technology Administration, Bureau
of Transportation Statistics, National
Transportation Statistics, table 1-11,
available at http://www.bts.gov.
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