The Henryton Tunnel, located near Henryton in southern Carroll County,

Maryland Maryland ( ) is a state in the Mid-Atlantic region of the United States. It shares borders with Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware and the Atlantic Ocean to ...

, is the third-oldest

tunnel A tunnel is an underground passageway, dug through surrounding soil, earth or rock, and enclosed except for the entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube cons ...

in the world that remains in active railroad use.Steve Okonski'
B&O RR Photo Tours from Woodstock to Henryton
/ref> Constructed by the

Baltimore and Ohio The Baltimore and Ohio Railroad was the first common carrier railroad and the oldest railroad in the United States, with its first section opening in 1830. Merchants from Baltimore, which had benefited to some extent from the construction of ...

(B&O) Railroad and opened around 1850, it was the first tunnel constructed on the B&O's Old Main Line. In 1865 the tunnel was widened to accommodate

double track A double-track railway usually involves running one track in each direction, compared to a single-track railway where trains in both directions share the same track. Overview In the earliest days of railways in the United Kingdom, most lin ...

. It was rebuilt into its current form in 1903. The tunnel has

brick A brick is a type of block used to build walls, pavements and other elements in masonry construction. Properly, the term ''brick'' denotes a block composed of dried clay, but is now also used informally to denote other chemically cured cons ...

portals and lining. The

coping Coping refers to conscious strategies used to reduce unpleasant emotions. Coping strategies can be cognitions or behaviours and can be individual or social. Theories of coping Hundreds of coping strategies have been proposed in an attempt to ...

and footings are

concrete Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. Concrete is the second-most-used substance in the world after water, and is the most wi ...

References

External links

*Steve Okonski'
B&O RR Photo Tours from Woodstock to Henryton
photos of the tunnel and its approaches

Railroad tunnels in Maryland Baltimore and Ohio Railroad tunnels CSX Transportation tunnels Transportation buildings and structures in Carroll County, Maryland Tunnels completed in 1850 {{US-tunnel-stub

See also

References

External links