Henryton Tunnel

The Henryton Tunnel, located near Henryton in southern Carroll County, Maryland, is the third-oldest tunnel in the world that remains in active railroad use. Constructed by the Baltimore and Ohio (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. It was rebuilt into its current form in 1903. The tunnel has brick portals and lining. The coping and footings are concrete.

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Wikidata
railway tunnel, United States, 

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Location: 39.3512, -76.9128, KML, Cluster Map, Maps,
5 places

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  Cross Ore Bank ⓘ
  abandoned mine in Baltimore County, Maryland, United States of America

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  Baltimore and Potomac Tunnel ⓘ
  railroad tunnel in Maryland, a bottleneck of the Northeast Corridor

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  Henryton Tunnel ⓘ
  railway tunnel in Henryton, Maryland

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  Howard Street Tunnel ⓘ
  

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  Union Tunnel (Baltimore) ⓘ
  underpass on the Northeast Corridor

Frameless

Type	Subtype	Date	Description	Notes	Source
site	mine		Cross Ore Bank	abandoned mine	Wikidata
site	tunnel		Baltimore and Potomac Tunnel	railway tunnel	Wikidata
site	tunnel		Henryton Tunnel	railway tunnel	Wikidata
site	tunnel		Howard Street Tunnel	CSX Transportation, railway tunnel	Wikidata
site	tunnel		Union Tunnel (Baltimore)	railway tunnel	Wikidata