This is a list of fallen flag railroads that have merged with various major railroads in the United States.
Union Pacific Mergers[]
- Chicago & North Western Transportation Company
- Denver & Rio Grande Western
- Missouri-Kansas-Texas (The Katy)
- Missouri Pacific
- Southern Pacific
- St. Louis Southwestern (Cotton Belt)
- Western Pacific
BNSF Mergers[]
- Great Northern
- Northern Pacific
- Spokane, Portland & Seattle
- Chicago, Burlington & Quincy (Burlington Route)
- Colorado & Southern
- St. Louis-San Francisco (Frisco)
- Burlington Northern
- Atchison, Topeka & Santa Fe (Santa Fe)
Norfolk Southern Mergers[]
- Erie Railroad
- Illinois Terminal
- Delaware, Lackawanna & Western
- Central Railroad of New Jersey (Jersey Central)
- New York Central
- Penn Central Transportation Company
- Reading Company
- Savannah & Atlanta
- Virginian Railway
- Wabash Railroad
- Erie Lackawanna
- New York, New Haven & Hartford (New Haven)
- Central of Georgia
- Conrail
- Interstate Railroad
- Lehigh Valley
- Monongahela Railway
- New York, Chicago & St. Louis (Nickel Plate Road)
- Pennsylvania Railroad
- Norfolk & Western
- Southern Railway
- Norfolk Southern (Original Railroad)
CSX Transportation Mergers[]
- Chesapeake & Ohio
- Baltimore & Ohio
- Western Maryland (Not the Western Maryland Scenic Railroad)
- Pere Marquette
- Seaboard Coast Line
- Louisville & Nashville
- Clinchfield Railroad
- Georgia Railroad & Banking Company
- Atlanta & West Point
- Western Railway of Alabama
- Chessie System
- Seaboard System