P rivate investors remain committed to raising money to finance infrastructure in the U. But private equity and infrastructure funding experts say private investment alone cannot guarantee the development of roads and bridges, as well as pipelines and ports. They say commitment from the federal government is needed to provide long-term financing and to connect money with projects that need it. But to put the infrastture to use, there have to be projects. And that requires public-sector support, from a financial standpoint, and to be project champions to ensure the projects get. Blackstone is the latest private entity to promise private capital to boost U. It would be the largest fund dedicated to infrastructure ever raised by a U. Tony James, president of Blackstone, said in an Oct.