National Gateway is a multi-stage railroad construction project in the United States promoted by CSX Transportation, a unit of CSX Corporation. It is designed to improve rail connections between ports in the U.S. mid-Atlantic seaboard and the Midwest by upgrading bridges and tunnels to allow taller freight trains (ones carrying double-stack intermodal containers). In 2008 the company announced its plans to invest $300 million, and is seeking investment from state governments and the U.S. federal government of an additional $400 million as a public-private partnership.^[1] Phase 1 of the $850 million project, between CSX's existing terminal in Chambersburg, Pennsylvania, and its hub facility in Northwest Ohio. was completed in September 2013.^[2]

This article uses bare URLs, which are uninformative and vulnerable to link rot. (September 2022)

An unrelated project with the same name was founded in 2001 as an engineering test between global communication networks.^[3]

• Northwest Ohio Intermodal Terminal in North Baltimore, Ohio. Funded completely by CSX. Opened February 2011.^[4][5] A number of tunnels were open cut for the project including:
  • Shoo Fly Tunnel (2012)
  • Pinkerton Tunnel (2012)
  • Benford Tunnel (2012)
• Virginia Avenue Tunnel in Washington, DC (2018). Tunnel rebuilt using cut-and-cover to double track and allow for double-stacked containers.^[6]

• Rail corridor parallel to Interstate 70 and Interstate 76 between Washington, D.C. and northwest Ohio, via Pittsburgh. Federal funding approved in December 2010.^[7]
• Lowering track on the Capital Subdivision in Maryland.^[8]
• Replacing bridges and modifying tunnels on the Metropolitan Subdivision in Maryland.^[8]

• Rail corridor parallel to Interstate 95 between North Carolina and Baltimore, via Washington, D.C.
  • Lowering track and modifying the Long Bridge on the RF&P Subdivision in Washington
  • Replacing a bridge on the RF&P Subdivision in Woodbridge, Virginia
• Washington, D.C. - Ohio rail corridor
  • New intermodal terminal in western Pennsylvania.
  • New intermodal rail yard in Columbus, Ohio.
• Carolina Corridor between Wilmington and Charlotte

• National Docks Secondary and Long Dock Tunnel
• List of CSX Transportation lines
• Heartland Corridor – Norfolk Southern Railway improvement project
• Norfolk Southern Crescent Corridor
• Virginia Port Authority
• Transportation Investment Generating Economic Recovery, a stimulus program providing some of the funding
• MidAmerica Corridor^[9]