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- United States10
- United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee on Surface Transportation9
- United States. Congress. Senate. Committee on Environment and Public Works. Subcommittee on Water Resources, Transportation, and Infrastructure9
- United States. Congress. Office of Technology Assessment6
- United States. Federal Railroad Administration. Office of Research and Development6
- United States. Congress. House. Committee on Energy and Commerce. Subcommittee on Transportation and Hazardous Materials5
- United States. Congress. House. Committee on Public Works and Transportation. Subcommittee on Surface Transportation3
- United States. Congress. House. Committee on Science and Technology. Subcommittee on Transportation, Aviation, and Materials3
- United States. Congress. House. Committee on Science, Space, and Technology. Subcommittee on Transportation, Aviation, and Materials3
- United States. Congress. Office of Technology Assessment3
- United States. Federal Railroad Administration3
- United States. Maglev Technology Advisory Committee3
- Bachman, John A.2
- Battelle Memorial Institute. Columbus Laboratories2
- Gieras, Jacek F.2
- Groh, Kenneth Robert2
- Hassenzahl, William2
- Piech, Zbigniew J.2
- United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Railroads2
- United States. Congress. Senate. Committee on Environment and Public Works2