New additions include streetcar projects in New Orleans; Cincinnati; and Washington, D.C., totaling $490 million. True high-speed rail projects like California’s still fail to crack the list due to escalating costs.

With $14 billion in projects in the works, Toronto Transit Commission jumps from No. 15 last year to take 2010's No. 1 slot. ARRA funds are still having a big impact in the U.S.; however, ongoing budget issues and lack of federal transportation authorization still threaten many agencies and their ongoing projects.