| Name
 | 
Reporting mark
 | 
System[nb 1]
 | 
From
 | 
To
 | 
Successor
 | 
Notes
 | 
| Alexandria and Fredericksburg Railway
 | 
 | 
RF&P
 | 
1872
 | 
1890
 | 
Baltimore and Potomac Railroad
 | 
 | 
| Alexandria and Washington Railroad
 | 
 | 
RF&P
 | 
1854
 | 
1872
 | 
Alexandria and Fredericksburg Railway
 | 
 | 
| Baltimore and Ohio Railroad
 | 
B&O, BO
 | 
B&O
 | 
1831
 | 
1987
 | 
Chesapeake and Ohio Railway
 | 
 | 
| Baltimore and Potomac Railroad
 | 
 | 
PRR
 | 
1867
 | 
1902
 | 
Philadelphia, Baltimore and Washington Railroad
 | 
 | 
| Chesapeake Beach Railway
 | 
 | 
 | 
1896
 | 
1935
 | 
East Washington Railway
 | 
 | 
| Chesapeake and Ohio Railway
 | 
C&O, CO
 | 
C&O
 | 
1891
 | 
1987
 | 
CSX Transportation
 | 
 | 
| Consolidated Rail Corporation
 | 
CR
 | 
 | 
1976
 | 
1999
 | 
CSX Transportation/Norfolk Southern Railway
 | 
 | 
| East Washington Railway
 | 
 | 
 | 
1935
 | 
1976
 | 
N/A
 | 
 | 
| Georgetown Barge, Dock, Elevator and Railway Company
 | 
 | 
B&O
 | 
1888
 | 
1972
 | 
Baltimore and Ohio Railroad
 | 
 | 
| Orange, Alexandria and Manassas Railroad
 | 
 | 
SOU
 | 
1872
 | 
1872
 | 
Virginia and North Carolina Railroad
 | 
 | 
| Penn Central Transportation Company
 | 
PC
 | 
 | 
1968
 | 
1976
 | 
Consolidated Rail Corporation
 | 
 | 
| Pennsylvania Railroad
 | 
PRR
 | 
PRR
 | 
1918
 | 
1968
 | 
Penn Central Transportation Company
 | 
 | 
| Philadelphia, Baltimore and Washington Railroad
 | 
 | 
PRR
 | 
1902
 | 
1976
 | 
Consolidated Rail Corporation
 | 
 | 
| Philadelphia, Wilmington and Baltimore Railroad
 | 
 | 
PRR
 | 
1891
 | 
1902
 | 
Philadelphia, Baltimore and Washington Railroad
 | 
 | 
| Richmond and Danville Railroad
 | 
 | 
SOU
 | 
1886
 | 
1894
 | 
Southern Railway
 | 
 | 
| Richmond, Fredericksburg and Potomac Railroad
 | 
RF&P, RFP
 | 
RF&P
 | 
1920
 | 
1991
 | 
Richmond, Fredericksburg and Potomac Railway
 | 
 | 
| Richmond, Fredericksburg and Potomac Railway
 | 
RFP
 | 
 | 
1991
 | 
 | 
 | 
Still exists as a  subsidiary of CSX Transportation
 | 
| Southern Railway
 | 
SOU
 | 
SOU
 | 
1894
 | 
1990
 | 
Norfolk Southern Railway
 | 
 | 
| Southern Maryland Railroad
 | 
 | 
 | 
1882
 | 
1886
 | 
Washington and Potomac Railroad
 | 
 | 
| Virginia Midland Railway
 | 
 | 
SOU
 | 
1880
 | 
1886
 | 
Richmond and Danville Railroad
 | 
 | 
| Virginia and North Carolina Railroad
 | 
 | 
SOU
 | 
1872
 | 
1873
 | 
Washington City, Virginia Midland and Great Southern Railway
 | 
 | 
| Washington, Alexandria and Georgetown Railroad
 | 
 | 
RF&P
 | 
1862
 | 
1868
 | 
Alexandria and Washington Railroad
 | 
 | 
| Washington City and Point Lookout Railroad
 | 
 | 
B&O
 | 
1873
 | 
1874
 | 
Baltimore and Ohio Railroad
 | 
 | 
| Washington City, Virginia Midland and Great Southern Railway
 | 
 | 
SOU
 | 
1873
 | 
1880
 | 
Virginia Midland Railway
 | 
 | 
| Washington and Potomac Railroad
 | 
 | 
 | 
1886
 | 
1900
 | 
Washington, Potomac and Chesapeake Railroad
 | 
 | 
| Washington, Potomac and Chesapeake Railroad
 | 
 | 
 | 
1901
 | 
1910
 | 
Washington, Potomac and Chesapeake Railway
 | 
 | 
| Washington, Potomac and Chesapeake Railway
 | 
 | 
 | 
1910
 | 
1918
 | 
Chesapeake Beach Railway
 | 
 | 
| Washington Southern Railway
 | 
WSN
 | 
RF&P
 | 
1901
 | 
1920
 | 
Richmond, Fredericksburg and Potomac Railroad
 | 
 | 
| Washington Terminal Company
 | 
WATC
 | 
B&O/ PRR
 | 
1901
 | 
 | 
 | 
Still exists as a subsidiary of the National Railroad Passenger Corporation (Amtrak)
 | 
| Washington and Western Maryland Railroad
 | 
 | 
B&O
 | 
1889
 | 
1985
 | 
N/A
 | 
 |