Author/Creator
- United States. Bureau of Transportation Statistics19
- United States. Department of Transportation8
- United States. National Transportation Safety Board8
- United States. Federal Transit Administration7
- United States. Federal Highway Administration5
- John A. Volpe National Transportation Systems Center (U.S.)4
- United States. Bureau of Transportation Statistics, issuing body4
- Center for Transportation Information (U.S.)3
- Moody's Investors Service3
- Transportation Systems Center3
- Transportation Systems Center. Information Management Branch3
- Transportation Systems Center. Statistical Information Reporting Branch3
- United States. Congress. Senate. Committee on Commerce, Science, and Transportation3
- United States. Department of Transportation. Research and Special Programs Administration3
- American Railway Association. Car Service Division2
- American Society of Traffic and Transportation2
- American Street Railway Association. Meeting2
- Datamonitor (Firm)2
- Defense Transport Administration (U.S.)2
- La Salle Extension University2