The Department of Transportation is moving through the final stages of establishing the National Multimodal Freight Network, a federally designated system of highways, railroad lines, maritime routes, airports, and ports that together form the critical infrastructure backbone of U.S. commercial goods movement. The network, mandated under the Fixing America’s Surface Transportation Act and carried forward under the Infrastructure Investment and Jobs Act of 2021, is intended to serve as the baseline framework for assessing freight system performance and directing federal investment.