The Department of Transportation looks after federal highway, air, railroad and other forms of transportation. 

It includes the Federal Railroad Administration, Federal Highway Administration, Federal Motor Carrier Safety Administration, Pipeline and Hazardous Materials Safety Administration and other exciting bodies. 

Its mission is to: “Serve the United States by ensuring a fast, safe, efficient, accessible and convenient transportation system that meets our vital national interests and enhances the quality of life of the American people, today and into the future.”

The spreadsheet with contact details can be accessed and downloaded here.