Metro-North Railroad
- Serves New York and Connecticut. Information on schedules, fares, announcements. Online ticket purchases are also available.
- http://mta.info/mnr/

ATC Public Transportation
- Fixed route and paratransit operations and management services throughout the country.
- http://www.atc-nec.com

American Public Transit Association
- An international organization for the bus, rapid transit and commuter rail systems industry, based in Washington, DC. Extensive directory of transit systems in the United States.
- http://www.apta.com/

South West Transit Association
- Trade association for public transit agencies in Arkansas, Arizona, Kansas, Louisiana, New Mexico, Oklahoma, and Texas.
- http://www.swta.org/

NJ Transit / PATH / New York City Subway Information
- Includes New Jersey Transit schedules and station information, subway station and line information, subway directions, and information about all three New York City area systems.
- http://www.njnyrails.com

Federal Transit Administration
- Compiles statistics and makes recommendations for U.S. mass transit.
- http://www.fta.dot.gov/