2008 and Sound Transit 3 in 2016, enabled the planning of future Link light rail extensions, scheduled to open in stages between 2021 and 2040. The Northgate Link extension opened on October 2, 2021, and is set to be followed by the East Link Extension in 2023, creating a new line to Bellevue and Redmond. During construction related to East Link in early 2020, trains within the downtown transit tunnel were temporarily limited to single-track operations and divided into two lines at Pioneer Square station. As part of the Sound Transit 2 program, the 1Line will be extended north to Lynnwood in 2024 and south to Federal Way in 2025. The line would have trains every eight minutes at peak and ten minutes mid-day and on weekends, with a combined frequency of four minutes at peak and five minutes off-peak between International District/Chinatown and Lynnwood City Center stations. In 2032, the 3 Line to West Seattle will begin service, temporarily operating between Alaska Junction and SODO station. The opening of an extension to Ballard by 2039, traveling via a new tunnel through Downtown Seattle, will split the corridor between two lines: the 1Line, operating from Ballard to Tacoma via the Rainier Valley and Sea-Tac Airport; and the 3Line, operating from Lynnwood (and later Everett) to West Seattle. Two infill stations along the current route of the 1Line are planned to open in 2031 at South Graham Street in the Rainier Valley and Boeing Access Road in northern Tukwila. Notes References External links Official Sound Transit website 1500 V DC railway electrification 2009 establishments in Washington (state) Seattle Link light rail Railway lines opened in 2009 Transportation in King County, Washington Transportation in Seattle