Union Tunnel - Baltimore - was created in 1873.
Baltimore Harbor Tunnel was created in 1957.
Union Railroad of Baltimore was created in 1866.
Union Railroad of Baltimore ended in 1976.
Milford Tunnel was created in 1839.
Am Tunnel was created in 1993.
Mount Victoria Tunnel was created in 1931.
Sideling Hill Tunnel was created in 1940.
Cascade Tunnel was created in 1900.
Liberty Tunnel was created in 1924.
Northbrae Tunnel was created in 1912.
Townline Tunnel was created in 1972.
Tar Tunnel was created in 1787.