Figure 2,,,,,,
Transportation GDP by Mode,,,,,,

Billions of dollars,,,,,,
,Railroad,Water ,Air,Pipeline,For-hire trucking,In-house trucking
1992,34.4,12.8,42.2,19.6,83.4,121.5
1996,41.5,11.2,59.3,22.7,101.5,142.0

"SOURCE: U.S. Department of Transportation, Bureau of Transportation ",,,,,,
"Statistics, special tabulation, September 2000.",,,,,,