The Southeast Corridor (SEC) is a proposed passenger rail transportation project in the Mid-Atlantic and Southeastern United States to extend high-speed passenger rail services from the current southern terminus of the Northeast Corridor in Washington, D.C.. Routes would extend south via Richmond and Petersburg, Virginia, with a spur to Norfolk in Virginia's Hampton Roads region; the mainline would continue south to Raleigh, Durham, Greensboro, and Charlotte, North Carolina. Since the corridor was first established in 1992, the U.S. Department of Transportation (USDOT) has extended it further to Atlanta, Georgia and Macon, Georgia; Greenville, South Carolina; Columbia, South Carolina; Jacksonville, Florida; and Birmingham, Alabama.