Federal Agencies
- Bureau of Transportation Statistics (BTS)
- Federal Highway Administration, Freight Management & Operations
- Federal Railroad Administration (FRA)
- Federal Railroad Administration, Office of Safety Analysis (Rail accident statistics)
- Library of Congress
- National Transportation Safety Board (NTSB)
- Surface Transportation Board (STB)
- Transportation Research Board (TRB)
- Volpe National Transportation Systems Center
- U.S. Department of Transportation (US DOT)
Federal Legislative Bodies and Resources
- Code of Federal Regulations
- Federal Register
- Regulations.gov
- United States Code
- U.S. House of Representatives
- U.S. Senate
State Legislative Bodies and Resources
- Iowa General Assembly (Iowa House and Iowa Senate)
- Iowa Law (Iowa Code and Iowa Administrative Code)
Organizations
- American Association of State Highway and Transportation Officials (AASHTO)
- Council on Rail Transportation
- American Railway Engineering and Maintenance of Way Association (AREMA)
- American Short Line and Regional Railroad Association (ASLRRA)
- Association of American Railroads (AAR)
- Iowa Association of Railroad Passengers
- Iowa League of Cities
- Iowa State Association of Counties (ISAC)
- North American Rail Shippers Association (NARS)
- Operation Lifesaver