- American Public Transportation Association
 - Public transit industry information including press releases, legislative updates, statistics, publications, and membership services. - International Union of Public Transport (UITP)
- Independent body researching into and organizing conferences on public transport.
- National Station Car Association
- Small electric cars for access to mass transit stations.
 Canadian Urban Transit Association
- Center for Transportation Excellence
- Policy research centre that provides information on the benefits of light rail and other forms of public transportation.
- South West Transit Association
- Offers services and training for transit operators. Represents members in AZ, AK, KS, LA, OK, TX, and in Mexico.
- Advanced Transit Association
- Exists to focus attention on unmet urban transportation needs and the ways in which advanced transit concepts can help satisfy them.
- Michigan Public Transit Association
- Strives to encourage and promote the use of public transit systems within the state.
- Union of Canadian Transportation Employees
- Includes national office information, local section, special events, press releases, and more.
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