• List of railroads in Washington, D.C.

A

• Alexandria and Fredericksburg Railway
• Alexandria and Washington Railroad
• Anacostia and Potomac River Railroad

B

• Baltimore and Ohio Railroad
• Baltimore and Potomac Railroad
• Baltimore and Washington Transit Company

C

• Canadian Pacific Railway
• Capital Traction Company
• Capital Transit Company
• Capitol, North O Street and South Washington Railway
• Chesapeake Beach Railway
• Chesapeake and Ohio Railway
• Columbia Railway
• Conrail

D

• Delaware and Hudson Railway

E

• East Washington Railway

G

• Georgetown and Tennallytown Railway
• Great Falls and Old Dominion Railroad

M

• Metropolitan Railroad
• Metropolitan Railroad (Maryland)

N

• Northern Virginia trolleys

O

• Orange, Alexandria and Manassas Railroad

P

• Penn Central Transportation Company
• Pennsylvania Railroad
• Philadelphia, Baltimore and Washington Railroad
• Philadelphia, Wilmington and Baltimore Railroad

R

• Richmond and Danville Railroad
• Richmond, Fredericksburg and Potomac Railroad
• Rock Creek Railway

S

• Southern Maryland Railroad
• Southern Railway (U.S.)
• Streetcars in Washington, D.C.

T

• Tennallytown and Rockville Railroad

W

• Washington, Baltimore and Annapolis Electric Railroad
• Washington, Baltimore and Annapolis Electric Railway
• Washington City and Point Lookout Railroad
• Washington and Georgetown Railroad
• Washington and Potomac Railroad
• Washington, Potomac and Chesapeake Railway
• Washington Railway and Electric Company
• Washington Southern Railway
• Washington Traction and Electric Company