Silver Line (Washington Metro)
| Company type | Rapid transit route |
|---|---|
| Industry | Public transportation |
| Founded | 2014 |
| Headquarters | Washington, D.C. , United States |
Area served | Loudoun County, Fairfax County, Arlington County (Virginia); Washington, D.C.; Prince George's County (Maryland) |
| Products | Rapid transit service |
| Parent | Washington Metro |
Silver Line
The Silver Line is a rapid transit route within the Washington Metro network, connecting 39 stations throughout Loudoun, Fairfax, and Arlington counties in Virginia; Washington, D.C.; and Prince George's County, Maryland. Its service extends from in Loudoun County to both Largo and New Carrollton stations in Maryland.
This line shares tracks with other Metro lines at various points: five stations from Largo to overlap with the Blue Line, another five stations from New Carrollton to are common with the Orange Line, thirteen stations between and are served by both the Orange and Blue Lines, and five stations between and run concurrently with the Orange Line. Only 11 stations, spanning from to , are dedicated exclusively to the Silver Line. Phase 1 introduced five of these exclusive stops on July 26, 2014, while Phase 2 added six additional stations on November 15, 2022.
The portion between the Orange Line divergence and , located entirely within Fairfax County, constitutes Phase 1 of the Dulles Corridor Metrorail Project. Phase 2 extended the line by an extra to reach Ashburn via Dulles International Airport. This $6.01 billion initiative, covering 23.1 miles, marks the largest expansion of Metro’s rail mileage since its establishment in 1976.
Train frequencies are scheduled every 10 minutes during weekday peak periods, every 12 minutes during off-peak times and weekends, and every 15 minutes after 9:30 pm daily.
Planning
In the 1960s, the federal government—which owned Dulles International Airport prior to the creation of MWAA by Congress—constructed the Dulles Access Road to link the airport with Washington, D.C., along Virginia State Route 267. The highway’s median was intentionally preserved for future rail transit development, and West Falls Church station was designed with provisions for a potential extension in that direction. The initial Metrorail blueprint from 1968 already envisioned an extension toward Dulles. In 1969, Senator William B. Spong Jr. advocated unsuccessfully for accelerated construction of this extension. A feasibility study conducted in 1971 projected a daily ridership of approximately 30,000 on the proposed Dulles line.
The Virginia General Assembly authorized the Commonwealth Transportation Board (CTB) in 1995 to allocate surplus net revenues from the Dulles Toll Road toward transit enhancements, including rail projects.
In 1998, Raytheon suggested implementing a Bus Rapid Transit (BRT) system along the Dulles Corridor. The following year, the Tysons-Dulles Corridor Group—which included Bechtel Corporation—put forward an alternative BRT plan incorporating rail service extended to Ashburn. These competing proposals prompted VDOT to assess both BRT and heavy rail options.
Although conversations about extending Metro service to Dulles began as early as 1976, comprehensive planning did not commence until around 2000 with the initiation of the Dulles Corridor Rapid Transit Project’s "scoping" phase. This process involved thorough Alternatives Analysis and environmental impact assessments, ultimately selecting a rail-only solution. Initial environmental hearings concluded favorably in August 2002. While phase one was initially planned to terminate at Tysons Corner, officials opted to extend it further to Reston’s Wiehle Avenue station to guarantee MWAA that rail service would eventually reach Dulles Airport. The project received official approval on June 10, 2004.
In February 2005, CTB sanctioned a $0.50 toll increase on the Dulles Toll Road effective May 22, dedicating a minimum of 85% of surplus toll revenues toward transit improvements and rail development within the corridor. Between July 1, 2003, and November 1, 2008—when control of the toll road transferred to MWAA—more than $138 million in surplus toll revenue plus interest was directed toward funding the Silver Line project.
Financing
The initial funding strategy for the Silver Line involved increasing tolls on the Dulles Toll Road by 50 cents—split evenly as 25 cents at the main plaza and 25 cents at ramp plazas. Nonetheless, escalating expenses prompted the MWAA Board to authorize higher toll surcharges. Starting January 1, 2010, toll surcharges rose to 50 cents at both main and ramp plazas, with further 25-cent increments planned for 2011 and 2012. These additional charges were intended to finance MWAA's 52.6% portion of the anticipated $5.25 billion total cost for Phases 1 and 2, aimed at covering roughly $220 million annually in debt service by the year 2020. This financial plan presumed no federal funding beyond the $900 million allocated to Phase 1.
By 2012, tolls had climbed to $2.25, equating to approximately 16 cents per mile traveled. Public resistance was significant, with opposition comments outnumbering supportive ones by about threefold. As projected expenses increased from $5.25 billion to $6.8 billion, no definitive funding solution was established to close the gap.
Tysons Corner tunnel dispute
Between 2000 and 2004, WMATA evaluated a design featuring twin tunnels between McLean and Spring Hill stations with all four stations located underground (known as Alignment T13). This option was ultimately dismissed due to its $3.5 billion price tag—$422 million higher than the primarily elevated Alignment T6—and concerns about potential cost overruns linked to uncertain subsurface conditions. Instead, planners opted for mostly elevated structures combined with a short tunnel segment between Tysons and Greensboro stations.
In 2005, engineers investigated the feasibility of large-diameter tunneling beneath Tysons but determined it offered no substantial cost advantage over the shorter tunnel alternative. Accusations emerged suggesting that design contractors had inflated tunnel cost estimates to prevent sharing work with external firms, leading an advisory committee led by the American Society of Civil Engineers in 2006 to reassess the options.
On September 6, 2006, Virginia Governor Tim Kaine selected an elevated alignment through Tysons, citing fears that a tunnel could risk federal funding despite acknowledging it as the preferred approach.
Following this decision, the Greater McLean Chamber of Commerce established Tysons Tunnel, Inc., advocating for a tunnel and submitting a technical proposal. However, a March 2007 report from an independent consultant cautioned that a large-bore tunnel might fail federal cost-effectiveness requirements, potentially jeopardizing federal funding.
Tysons Tunnel, Inc. filed suit against the U.S. Department of Transportation and Federal Transit Administration (FTA) in November 2007 after their request for reconsideration was denied but ceased operations by 2010.
Construction commencement was postponed pending FTA evaluation of Virginia’s request for the $900 million federal contribution. In January 2008, FTA assigned a "medium–low" rating to the project due to MWAA’s limited experience with large design-build contracts, overly optimistic toll revenue forecasts, and Metro’s constrained capacity to maintain the new line. Governor Kaine secured an extension to address these issues before fixed-price contracts expired.
On April 30, 2008, FTA reversed its prior rating and approved the above-ground project as meeting cost-efficiency and ridership criteria, allowing it to proceed toward final design and federal funding approval on December 4, 2008.
U.S. Transportation Secretary Ray LaHood officially granted the $900 million federal funding on March 10, 2009; major construction activities began shortly thereafter with utility relocations commencing in mid-2008 at Tysons.
Construction
In May 2013, MWAA secured a distinct design-build agreement for Phase 2, initially aiming for completion by 2018; this timeline was subsequently pushed back to 2022.
Although construction was planned to begin in 2005, delays in funding caused postponements. On November 1, 2008, responsibility shifted from the Virginia Department of Transportation (VDOT) to MWAA. Utility relocation efforts started that same year, with actual construction work commencing on March 12, 2009.
The first phase began operations on July 26, 2014, introducing five stations west of East Falls Church extending toward Largo. The entire route to Ashburn, which includes a station at Dulles International Airport, was originally projected to open by 2016 but ultimately launched on November 15, 2022, following several construction setbacks.
Pier support
During the development of the Orange Line in 1977, foundational structures intended for future Silver Line bridges over I-66 to the Dulles Access Road median were established up to ground level. These foundations comprised steel piles topped with concrete; however, comprehensive documentation has since been lost. To evaluate the condition of these piles, engineers excavated around the foundations for inspection.
Access challenges arose because some foundations are situated in restricted zones near I-66 and adjacent to the Orange Line's electrified third rail. While Dulles Transit Partners volunteered to examine seven accessible foundations, the Federal Transit Administration mandated testing of all foundations. This requirement led to weekend closures of the Orange Line segment between West Falls Church and East Falls Church stations. All inspected foundations met standards, enabling bridge construction to proceed using the existing supports.
Controversy
The $2.7 billion agreement between MWAA and Dulles Transit Partners (comprising Bechtel and Washington Group International) has faced criticism. Rather than employing traditional competitive bidding, this contract was awarded under the Virginia Public-Private Partnership Act and permits design and construction without a fixed cost limit. Although MWAA oversees design and construction activities, WMATA will be responsible for operating the Silver Line, which has raised concerns regarding project coordination.
Additionally, the contract contains escalation clauses imposing penalties ranging from $3 million to $6 million monthly for delays. Initially awarded by the Virginia Department of Rail and Public Transportation (VDRPT), control of the contract transferred to MWAA when it assumed project management in June 2007.
Commencement of Phase 1
The initial schedule aimed for revenue operations to begin in 2013. On February 7, 2014, the construction contractor declared the work finished to MWAA, which then had a fifteen-day review period. Nevertheless, on February 24, MWAA announced that the contractor had failed to satisfy seven out of twelve contractual requirements.
By March 19, 2014, MWAA reported problems including faulty public address speakers and a communications cable that did not comply with code standards, resulting in a delay without setting a new completion date. The objective was to transfer control of the line to WMATA by April 9. WMATA requested an additional 90 days for testing and employee training, projecting a potential opening date as early as July 4, 2014. On May 27, WMATA assumed control of the line, anticipating service commencement "within 90 days." The official inauguration date for the initial five stations was established as July 26.
The opening event included speeches broadcast on News Channel 8 and featured attendance by Virginia Governor Terry McAuliffe, Metro General Manager Richard Sarles, members of Metro's board of directors, DC Mayor Vincent C. Gray, along with other regional officials. A ribbon-cutting ceremony at marked the occasion shortly before passenger service began just after noon on July 26, 2014.
Despite attracting riders, the Silver Line's average weekday boardings during its first year were approximately 17,100—falling short of the forecasted 25,000 daily passengers.
Impact on the Metro map
The iconic Metro rail map, originally designed by Lance Wyman and Bill Cannan in 1976, is renowned for its "pop art" inspired visualization of the subway system. It employs thick lines for radial routes and ensures no more than two lines overlap at any single point. The introduction of the Silver Line created a three-line overlap between Rosslyn and Stadium–Armory stations, prompting WMATA in 2010 to explore redesign options. Various unofficial redesigns by graphic artists addressed this issue by reducing line thickness.
In 2003, WMATA unveiled a professional graphic depicting the Silver Line with thinner lines on an unofficial map that resembled the current layout. This design concept and others attracted media coverage. Since 2008, a similar map has been displayed in DC Councilman Jack Evans' office. Lance Wyman, co-creator of the original map, was confirmed in 2011 to serve as layout consultant for the redesign effort.
A thick-line variant included in Metro's Rush Plus plan illustrated the Silver Line diverging from the Orange Line between Ballston and , showing five unlabeled Phase 1 stations. The finalized map for Phase 1’s launch clearly depicts shared stations using dots on colored lines with small white extensions connecting to adjacent routes.
Phase 2: Extension to Dulles Airport
While Phase 1 construction toward Wiehle–Reston East was underway, planning and funding efforts advanced for Phase 2 extending through Dulles Airport. This included establishing a special taxing district in Herndon and holding public meetings. Initial cost projections of $2.75 billion escalated to $4.1 billion by 2010. On April 6, 2011, MWAA’s Board approved an underground station near the airport terminal at an extra $330 million expense, pushing back the anticipated opening to mid-2017. Opposition from former Governor Bob McDonnell prompted mediation offers from the U.S. Secretary of Transportation. By March 2012, costs were reduced to $2.7 billion by removing the underground station and implementing other savings.
The Loudoun County Board narrowly authorized extending the line into Loudoun County on July 3, 2012. The Phase 2 construction contract was awarded in April 2013 for $1.177 billion. In August 2014, the U.S. Department of Transportation issued a historic $1.28 billion TIFIA loan supporting Phase 2 as part of a $1.87 billion funding commitment.
Construction encountered obstacles including cracked concrete girders discovered in July 2015 and poorly designed cement walls vulnerable to water infiltration found in early 2018; contractors pledged repairs without affecting the planned opening in 2020. Allegations surfaced in May 2018 regarding improperly sourced precast concrete materials leading to lawsuits against Universal Concrete for defects. Approximately 400 flawed concrete rail ties were identified in September 2018 but remained unresolved by December.
Despite these challenges, progress continued steadily: construction was reported at 78% completion by June 2018, advancing to 86% by September and reaching 92% by January 2019. Testing commenced early in 2019 with initial train runs encountering some issues before continuing through March. By April that year, construction stood at roughly 95%.
Completion targets shifted multiple times: originally mid-2020; then delayed to September due to ongoing complications and budget limitations worsened by the COVID-19 pandemic. In December 2019, WMATA considered fully replacing defective concrete panels—a move that could postpone opening by another year.
By February 2020 construction approached 98% completion; however pandemic-related disruptions pushed expected opening to April 2021. Between March and June of that year several stations were bypassed due to COVID-19 restrictions but were all reopened by late June.
Beginning May 23, 2020, Silver Line service was suspended to enable station renovations and Phase 2 finalization amid historically low ridership levels. Integration of Phase 2’s control systems with WMATA’s network was completed by August; additional closures occurred late that year for dynamic testing purposes. Service resumed on August 16 with East Falls Church reopening one week later.
In September 2020 further structural cracks were detected at five stations; Metro postponed opening first until July then into Fall amid budget cuts linked to declining ridership figures. WMATA announced Blue Line platform reconstruction early in 2021 requiring Silver Line trains temporarily bypass Addison Road station.
By early 2021 Phase 2 construction neared full completion at approximately 99%, with passenger service anticipated in early that year’s second quarter. MWAA declared substantial completion in November; however WMATA projected about five months remained for testing before launch could occur. Completion of rail yard facilities and initial full-route testing were achieved by December.
WMATA assumed full operational control of Phase 2 in June 2022 and scheduled final testing through October with safety certification expected prior to opening day. The board authorized General Manager Randy Clarke to determine an official launch date during September. Simulated service testing took place October 3–17.
WMATA announced a likely pre-Thanksgiving opening late October but noted limited availability of operational 7000-series trains—due to earlier derailments and regulatory issues—as potential obstacles.
The extension officially commenced service on November 15, 2022 with a ceremony at Dulles International Airport, introducing six new stations and expanding Metro’s footprint into Loudoun County.
Subsequent modifications
Service between and Ballston-MU stations was temporarily halted on June 3, 2023, to facilitate track replacement work, with operations resuming on June 26, 2023.
The implementation of Automatic train operation (ATO) on the Silver Line commenced in June 2025. ATO had been suspended following the 2009 Red Line accident but was progressively reinstated across other lines throughout late 2024 and early 2025. Beginning June 22, 2025, half of the Silver Line trains were redirected from Largo—where they share tracks with the Blue Line—to , sharing tracks with the Orange Line. Additionally, weekday peak hours saw the introduction of short-turn services: morning trains operated between and New Carrollton, while afternoon services ran between and Wiehle-Reston East.
Route
The Silver Line’s core mission is to establish a rail connection between Washington, D.C. and Dulles International Airport, as well as to serve Northern Virginia’s prominent edge cities such as Tysons, Reston, Herndon, and Ashburn. It also aims to promote urban growth within Tysons—Virginia’s largest business hub and ranked twelfth nationwide. Furthermore, the line improves transit access to the Steven F. Udvar-Hazy Center, an extension of the National Air and Space Museum, with shuttle connections from .
Segments now part of the Silver Line originally opened as portions of the Orange and Blue Lines between 1977 and 2004. Unlike those earlier sections designed by WMATA, the Silver Line was planned and constructed by the Metropolitan Washington Airports Authority (MWAA), while WMATA operates it. The funding for Phase 1 consisted of 43% federal contributions ($900 million), 28% from a designated tax district imposed on adjacent commercial properties, and another 28% generated by a $0.50 toll increase on the Dulles Toll Road. Funding for Phase 2 comes jointly from Loudoun County, Fairfax County, the Commonwealth of Virginia, and MWAA.
Initially intended to terminate at , operational constraints at Stadium-Armory necessitated extending the eastern terminus to Largo. Westbound through Washington, D.C., the Silver Line shares tracks with both the Blue and Orange Lines before diverging east of station. From there, newly constructed tracks follow SR 267’s median corridor leading to an elevated bridge over SR 123 that serves key corporate offices such as Capital One and SAIC, along with two major malls in Tysons Corner. The route then passes beneath SR 7 via a tunnel featuring two elevated stations catering to western Tysons before rejoining SR 267’s median; Phase 1 concluded at Wiehle-Reston East.
Phase 2 continues westward along SR 267’s median towards Dulles Airport, adding four stations with platforms located within the highway median connected by pedestrian bridges to parking structures. Fairfax County had previously built a parking garage accommodating 1,750 vehicles near the future station site in 1999; although intended for bus commuters during construction, it attracted criticism due to construction deficiencies. At Dulles Airport, an elevated station is accessible through a pedestrian tunnel connecting to terminal facilities. Tracks proceed northward parallel to airport runways with a maintenance facility situated offsite. The final two stops are positioned in Ashburn along the Dulles Greenway corridor.
The Silver Line serves both air travelers and commuters from distant western suburbs that were formerly reliant on limited bus transit options. During peak periods, trains operate every six minutes, while off-peak service runs at fourteen-minute intervals.
Rolling stock
The newly introduced 7000-series railcars for Metro were procured at a cost of $3 million each. The Dulles Corridor Metrorail Project necessitated the acquisition of 128 cars—split evenly between Phase 1 and Phase 2 with 64 cars each. Additional units were purchased to phase out the older 1000-series trains and to support increasing passenger demand. The agreement for a total of 428 railcars was finalized on July 2, 2010.
Stations
The stations are presented using their officially designated names.[1]
| Station | Code | Opened | Other Metro Line(s) |
Notes |
|---|---|---|---|---|
| Template:Wmata | N12 | November 15, 2022 | Western endpoint Former planning names: Route 772, Ryan Road | |
| Template:Wmata | N11 | Previous planning names: Route 606, Morgan Road | ||
| Template:Wmata | N10 | |||
| Template:Wmata | N09 | Formerly known as Route 28, Herndon–Dulles East | ||
| Template:Wmata | N08 | Planning designations included Herndon–Monroe, Herndon–Reston West | ||
| Template:Wmata | N07 | Initially called Reston Parkway during planning | ||
| Template:Wmata | N06 | July 26, 2014 | Previously the western terminus Planning name: Wiehle Avenue | |
| Template:Wmata | N04 | July 26, 2014 | Planning titles: Tysons West, Spring Hill Road | |
| Template:Wmata | N03 | Planning references: Tysons Central 7, Pike Seven | ||
| Template:Wmata | N02 | Originally opened as Tysons Corner, renamed in 2022 | ||
| Template:Wmata | N01 | Planning labels: Tysons East, Tysons McLean, West Park | ||
| Template:Wmata | K05 | June 7, 1986 | Template:WMATA icon | Transfer point for the Orange Line (Western) |
| Ballston-MU | K04 | December 11, 1979 | ||
| Template:Wmata | K03 | |||
| Template:Wmata | K02 | |||
| Template:Wmata | K01 | |||
| Template:Wmata | C05 | July 1, 1977 | Template:WMATA icon Template:WMATA icon | Transfer hub for the Blue Line |
| Template:Wmata | C04 | |||
| Template:Wmata | C03 | Connected by walking transfer to Red Line at Farragut North station ("Farragut Crossing") | ||
| Template:Wmata | C02 | |||
| Template:Wmata | C01 | March 29, 1976 | Template:WMATA icon Template:WMATA icon Template:WMATA icon | Transfer hub for the Red Line |
| Template:Wmata | D01 | July 1, 1977 | Template:WMATA icon Template:WMATA icon | |
| Template:Wmata | D02 | |||
| Template:Wmata | D03 | Template:WMATA icon Template:WMATA icon Template:WMATA icon Template:WMATA icon | Transfer station for the Green and Yellow Lines; connection to VRE | |
| Template:Wmata | D04 | Template:WMATA icon Template:WMATA icon | ||
| Template:Wmata | D05 | |||
| Template:Wmata | D06 | |||
| Template:Wmata | D07 | |||
| Template:Wmata | D08 | Transfer station serving both the Orange and Blue Lines (Eastern) | ||
| Minnesota Avenue station | D09 | November 20, 1978 | Template:WMATA icon | |
| Deanwood station | D10 | |||
| Cheverly station | D11 | |||
| Landover station | D12 | |||
| New Carrollton station | D13 | Served by Amtrak routes Northeast Regional, Palmetto, and Vermonter MARC's Penn Line Planned MTA Purple Line Eastern terminus for half of Silver Line services | ||
| Template:Wmata | G01 | November 22, 1980 | Template:WMATA icon | |
| Template:Wmata | G02 | |||
| Template:Wmata | G03 | |||
| Template:Wmata | G04 | December 18, 2004 | ||
| Downtown Largo | G05 | Eastern endpoint for half of Silver Line runs |
Future
The originally planned Wolf Trap station was intended to be part of Phase 1, situated between Spring Hill and Wiehle-Reston East; however, it was ultimately removed from the plan due to concerns over its financial viability.
A 2013 analysis proposed extending the Silver Line northwestward into Loudoun County, terminating at Leesburg, the county seat. This extension would feature three new stations: VA 7 Bypass, Crosstrail Blvd, and Belmont Ridge. The study also explored the possibility of adding an infill station between Tysons (currently ) and McLean, or alternatively renaming Tysons. This would facilitate transfers with a suggested "Beltway Line" running parallel to the Capital Beltway, with the station designated as Beltway and 123.
In December 2019, WMATA initiated a review of modifications to the Orange, Blue, and Silver lines aimed at alleviating congestion at Rosslyn. Among the concepts is constructing a new Rosslyn II station adjacent to the existing one, enabling one line to diverge from the other two to boost overall capacity. Two scenarios involving the Silver Line were considered: one envisions it operating express from West Falls Church to Rosslyn II, including a new Ballston II stop en route, then proceeding along newly built tracks through Georgetown and several stops beneath M Street NW to Union Station. Beyond Union Station, this path would continue with new stations in Ivy City, Port Towns, Hyattsville, College Park II, and Greenbelt II. The alternative maintains the Silver Line’s current Virginia routing up to Rosslyn II before following fresh tracks through Georgetown and M Street NW to Union Station, then extending northeast through Ivy City, Port Towns, Landover Hills, ultimately linking with the Orange Line at New Carrollton.
See also
External links
- ↑ Station names approved by the Board of Supervisors in April 2012.