Manassas Gap Railroad
The Manassas Gap Railroad (MGRR) was a railroad that ran from Mount Jackson, Virginia, to the Orange and Alexandria Railroad's Manassas Junction, which later became the city of Manassas, Virginia. Chartered by the Virginia General Assembly in 1850, the MGRR was a 4 ft 8 in (1,422 mm) narrow gauge line whose 90 completed miles of track included 38 miles (61 km) of 60 pounds-per-yard T-rail and 52 miles (84 km) of 52 pounds-per-yard T-rail. A total of nine locomotives and 232 cars were operated on the line, serving 20 stations.
During the American Civil War, the Confederate Army used the railroad to move troops and raid the Baltimore and Ohio Railroad.
An extension to Harper's Ferry was planned and partially built, though the rail was never installed. Today, several portions of that unfinished roadbed, as well as some historic culverts and masonry, remain abandoned in Fairfax County.