California's high-speed rail project was billed as the future of transportation, but with President Trump moving to pull $4 billion in federal funds, its future remains precarious. Why it matters: The system was initially slated for completion in 2020.

The Trump administration said it would pull roughly $4 billion in federal funding for California’s long-planned high-speed train, a project that has, over decades, become an avatar for the country’s declining ability to complete transformative new infrastructure.

The Trump administration is once again seeking to end federal funding for California's high-speed rail project, following a lengthy review of the state's progress that found "no viable path" to completion.