Baltimore & Potomac Railroad

Reporting mark: B&P
Amtrak - B&P Tunnels (Baltimore County, Maryland)
Built 1873
Tunnel under Baltimore, MD on Amtrak Northeast Corridor
Open to traffic

CSX - Virginia Avenue Tunnel (1872) (Washington, District of Columbia)
Built 1872 by the Baltimore & Potomac Railroad
Tunnel on CSX Transportation
Replaced by a new tunnel