List_of_tunnels_documented_by_the_Historic_American_Engineering_Record_in_Maryland Knowpia

This is a list of tunnels documented by the Historic American Engineering Record in the U.S. state of Maryland.^[1]

Tunnels edit

Survey No.	Name (as assigned by HAER)	Built	Documented	Carries	Crosses	Location	County	Coordinates
MD-11	Baltimore & Ohio Railroad, Howard Street Tunnel	1895	1984	CSX Baltimore Terminal Subdivision	Howard Street	Baltimore	Independent city	39°18′17″N 76°37′15″W / 39.30472°N 76.62083°W / 39.30472; -76.62083
MD-15	Baltimore & Ohio Railroad, Point of Rocks Tunnel		1971	CSX Old Main Line Subdivision	Catoctin Mountain	Point of Rocks	Frederick	39°16′30″N 77°32′39″W / 39.27500°N 77.54417°W / 39.27500; -77.54417
MD-17	Baltimore & Ohio Railroad, Harpers Ferry Tunnel	1894	1970	Former Baltimore and Ohio Railroad	Elk Ridge	Maryland Heights	Washington	39°19′27″N 77°43′26″W / 39.32417°N 77.72389°W / 39.32417; -77.72389
MD-21	Baltimore & Ohio Railroad, Ilchester Tunnel	1903	1971	Former Baltimore and Ohio Railroad		Ilchester	Howard	39°15′00″N 76°45′44″W / 39.25000°N 76.76222°W / 39.25000; -76.76222

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^ Library of Congress. "Prints and Photographs Online Catalog: Historic American Buildings Survey/Historic American Engineering Record/Historic American Landscapes Survey". Retrieved April 30, 2014.