The American Public Transportation Association
http://www.publictransportation.org/
This national organization of public transportation providers aims to raise awareness of the benefits and importance of public transportation for the well-being of our cities.

The California Transit Association
http://www.caltransit.org/cgi-bin/default.asp
CTA is the primary advocate for policies that recognize and support public transit as an integral part of a sustainable transportation system in California.

The Southern California Regional Transit Training Consortium
http://www.scrttc.com
SCRTTC is a coalition of transit providers, community colleges and other groups, which are working to improve and standardize the training of transit employees. Courses for maintenance personal are being developed first.