a dual paved path containing a wide bicycle trail and an wide pedestrian trail. A wide strip of pavement separated the two routes, creating a wide transportation corridor that doubled the W&OD Trail's width. The two imperviously-surfaced trails traveled through a urban open space that a 2016 Falls Church master plan had called "The City's Greenest Street". The master plan's "Vision Statement" stated that the project would help "Develop the W&OD Park as a Great Street and greenway". Officials broke ground on the Falls Church "W&OD Dual Trails" project on August 26, 2020. The widened trail formally opened during a ribbon-cutting ceremony on October 7, 2021. The executive director of NOVA Parks, Paul Gilbert, stated during the event: "I envision over the next decade, more and more urban sections of the W&OD Trail will take on this dual trail methodology." Designations In 1987, the U. S. Department of the Interior designated the trail as a National Recreation Trail. In 1999, Virginia Department of Historic Resources staff determined that the "Washington and Old Dominion Railroad Historic District" (053-0276) was eligible for listing on the National Register of Historic Places (NRHP). A 2000 NRHP registration form states that the Historic District is eligible for the listing because the District "is associated with events that have made a significant contribution to the broad patterns of our history". The form contains an in-depth description of the District's historical resources and of the railroad's history, as well as maps that show the locations of the Districts's major historical features. Historic structures The park and its immediate surroundings contain a number of historic structures, some of which date to the pre-Civil War period. Most of these structures are railroad remnants, including intact stations at Vienna, Sunset Hills, Herndon, Hamilton and Purcellville, stone arches and culverts, the piers and abutments of bridges, and a relocated passenger shelter (formerly at the site of the Clarks Gap station at the present crossing of the trail and Dry Mill Road (VA 699); now at the former site of the Paeonian Springs station near Simpson Circle). Part of the reinforced concrete floor of a brick electrical substation that the railroad constructed in 1912 to help supply power to its new electric locomotives and trolley cars is visible in Arlington County's Bluemont Junction Railroad Display south of Wilson Boulevard. The floor is located in the space between a soccer field and a