The Dalecarlia Tunnel is an abandoned railroad tunnel in Brookmont

Brookmont, Maryland

Brookmont is a census-designated place and an unincorporated area in Montgomery County, Maryland, United States.-Geography:As an unincorporated area, Brookmont's boundaries are not officially defined...

, Maryland

Maryland

Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...

, near Washington, D.C.

Washington, D.C.

Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....

, that carries the Capital Crescent Trail

Capital Crescent Trail

The Capital Crescent Trail is an long, shared-use rail trail that runs from Georgetown in Washington, D.C., to Silver Spring, Maryland. The portion from Bethesda to Silver Spring is also called the Georgetown Branch Trail but is recognized as the Future Capital Crescent Trail.The Capital Crescent...

 underneath MacArthur Boulevard and the Washington Aqueduct

Washington Aqueduct

The Washington Aqueduct is an aqueduct that provides the public water supply system serving Washington, D.C., and parts of its suburbs. One of the first major aqueduct projects in the United States, the Aqueduct was commissioned by Congress in 1852, and construction began in 1853 under the...

.

It was built in 1910 as part of the Georgetown Branch of the Baltimore and Ohio Railroad

Baltimore and Ohio Railroad

The Baltimore and Ohio Railroad was one of the oldest railroads in the United States and the first common carrier railroad. It came into being mostly because the city of Baltimore wanted to compete with the newly constructed Erie Canal and another canal being proposed by Pennsylvania, which...

. It is a Roman arch

Arch

An arch is a structure that spans a space and supports a load. Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture and their systematic use started with the Ancient Romans who were the first to apply the technique to a wide range of structures.-Technical aspects:The...

 tunnel, measuring 18 feet (5.5 m) wide by 340 feet (103.6 m) long. It features decorative brick

Brick

A brick is a block of ceramic material used in masonry construction, usually laid using various kinds of mortar. It has been regarded as one of the longest lasting and strongest building materials used throughout history.-History:...

 facings on both ends and is lined with brick throughout its length.

CSX Transportation

CSX Transportation

CSX Transportation operates a Class I railroad in the United States known as the CSX Railroad. It is the main subsidiary of the CSX Corporation. The company is headquartered in Jacksonville, Florida, and owns approximately 21,000 route miles...

, the successor to the B&O Railroad, ceased train operations through the tunnel in 1985 and officially abandoned the rail line in 1986.

External links

• The Georgetown Branch - History and photos
• Capital Crescent Trail