The use of public-private partnerships is gaining traction among mass-transit developers in the U.S., but issues such as federal funding uncertainty and environmental permitting present challenges, according to this article. "State-of-good-repair projects are good candidates for P3s, but the private sector needs clarity of timeframes," says Karen Hedlund, deputy administrator of the Federal Railroad Administration. Also, unlike road projects where private concessionaires collect toll revenue, transit works "would depend on availability payments," said David Narefsky, a law partner at Mayer Brown.

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