Baltimore and Potomac Tunnel

The Baltimore and Potomac Tunnel (or B&P Tunnel) is a double-tracked, masonry arch railroad tunnel on the Northeast Corridor in Baltimore, Maryland, just west of Pennsylvania Station (Baltimore). Opened in 1873, the tunnel is the oldest tunnel operated by Amtrak . In 2008, the tunnel was used by about 140 Amtrak and MARC passenger trains and two freight trains every day.^[1]

The 7,669-foot (2,338 m) tunnel, which passes under the Baltimore neighborhoods of Bolton Hill, Madison Park, and Upton, is a single tube with two tracks. It is punctuated by two open-air cuts for ventilation of exhaust fumes and smoke—Pennsylvania Avenue Opening and John Street Opening—that divide the main tunnel into three "sub-tunnels", designated (from south to north) Gilmor Street Tunnel, Wilson Street Tunnel, and John Street Tunnel.^[1]^[2]^[3]

^ ^a ^b Brown, Matthew Hay (June 12, 2008). "House OKs funds for tunnel study: Alternative sought to outmoded passage that runs under city". The Baltimore Sun.
^ "Existing B&P Tunnel and Vicinity Map" (PDF). B&P Tunnel Project. May 2014. Archived from the original (PDF) on November 29, 2014. Retrieved November 19, 2014.
^ Cite error: The named reference Alternative2 was invoked but never defined (see the help page).

[Brown-1] Brown, Matthew Hay (June 12, 2008). "House OKs funds for tunnel study: Alternative sought to outmoded passage that runs under city". The Baltimore Sun.

[2] "Existing B&P Tunnel and Vicinity Map" (PDF). B&P Tunnel Project. May 2014. Archived from the original (PDF) on November 29, 2014. Retrieved November 19, 2014.

[Alternative2-3] Cite error: The named reference Alternative2 was invoked but never defined (see the help page).

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