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3 Line
Overview
Status	Planned
Owner	Sound Transit
Locale	Seattle metropolitan area, Washington, US
Termini	Everett Station (north) Alaska Junction (south)
Stations	25 (9 new, 1 provisional)
Service
Type	Light rail
System	Link light rail
History
Planned opening	2032 (West Seattle) 2037 (Southwest Everett) 2041 (Downtown Everett)
Technical
Number of tracks	2
Character	Underground, elevated, and surface
Track gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Electrification	Overhead line, 1,500 V DC
Operating speed	55 miles per hour (89 km/h)
Route map Legend Provisional route Everett Station (2041) SR 526/Evergreen SW Everett Industrial Center (2037) SR 99/Airport Road (provisional) Mariner Ash Way West Alderwood Everett Link Extension Lynnwood City Center Mountlake Terrace Shoreline North/185th Shoreline South/148th NE 130th Street (2026) Northgate Roosevelt U District University of Washington Montlake Cut Capitol Hill to Ballard (2039) Westlake Symphony Pioneer Square International District/ Chinatown to Downtown Redmond (2025) Stadium reroute (2039) SODO to Federal Way Downtown West Seattle Link Extension (2032) Duwamish Waterway Delridge Avalon Alaska Junction This diagram: view talk edit

The 3 Line (colored magenta) is a future light rail line in the Seattle metropolitan area in the U.S. state of Washington, to be part of Sound Transit's Link light rail system. It is planned to connect Everett and Snohomish County to Downtown Seattle and West Seattle. The 3 Line would share tracks with the 2 Line from southern Everett to International District/Chinatown station along the 1 Line corridor.

The line is planned to reuse existing tracks that are part of the 1 Line and its future expansions; the 1 Line will then be rerouted through a new Downtown Seattle tunnel to be built for the Ballard Link Extension. The 16.3-mile (26.2 km) Everett Link Extension to the north of Lynnwood will have six stations and is scheduled to open between 2037 and 2041. The 4.7-mile-long (7.6 km) West Seattle Link Extension will include three new stations southwest of SODO station and is scheduled to open in 2032. The 3 Line was created as part of the Sound Transit 3 program, approved by voters in 2016, which included both projects.

The West Seattle Link Extension would include a high bridge crossing the Duwamish River adjacent to the existing West Seattle Bridge. In 2024, Sound Transit and HNTB proposed a cable-stayed bridge design that would be 1,690 feet (520 m) long and have two towers that are 374 feet (114 m) tall. The western end of the line would be tunneled between Alaska Junction and Avalon stations, where trains would begin to use an elevated guideway. The project is expected to cost $6.7 to $7.1 billion to construct and carry 26,000 daily passengers.

The Everett Link Extension includes a new operations and maintenance facility that is scheduled to open in 2034 at one of three sites near Paine Field and the Boeing Everett Factory. The project is estimated to cost between $5.05 billion and $6.9 billion and open either as a single phase in 2037 with its funding shortfall addressed or in two phases from 2037 to 2041.

Stations

Names and locations for future stations are provisional.

References

1. ^ "Everett Link Extension: Timeline and milestones". Sound Transit. Retrieved September 4, 2024.
2. ^ Sound Transit future service (PDF) (Map). Sound Transit. August 2024. Retrieved September 4, 2024.
3. "2022 Progress Report". Sound Transit. February 2022. Retrieved January 2, 2023.
4. Watanabe, Ben (December 8, 2021). "City of Everett outlines light rail priorities for 2037". The Everett Herald. Retrieved January 2, 2023.
5. "West Seattle and Ballard Link Extensions: Expanding light rail in Seattle" (PDF). Sound Transit. August 2022. Archived from the original (PDF) on September 17, 2017. Retrieved January 2, 2023.
6. Lindblom, Mike (October 24, 2019). "Pricier light-rail tunnels into Ballard and West Seattle fall by the wayside". The Seattle Times. Retrieved January 2, 2023.
7. Miller, Brian (August 19, 2024). "Behold! Sound Transit shows 'diamond pylon' span over Duwamish". Seattle Daily Journal of Commerce. Retrieved September 4, 2024.
8. Newcomb, Tim (October 30, 2024). "Sound Transit Finalizes West Seattle Link Extension Alignment". Engineering News-Record. Retrieved December 2, 2024.
9. Lindblom, Mike (November 12, 2023). "West Seattle's light-rail path finally takes shape, at a price". The Seattle Times. Retrieved September 4, 2024.
10. Lindblom, Mike (September 18, 2024). "West Seattle's light rail estimate soars past $6 billion". The Seattle Times. Retrieved December 2, 2024.
11. "Everett Link Extension fact sheet" (PDF). Sound Transit. September 2023. Retrieved September 4, 2024.
12. Lindblom, Mike (June 23, 2023). "Sound Transit charts its long light-rail journey to Everett". The Seattle Times. Retrieved September 4, 2024.
13. "Avalon Station". West Seattle Link Extension. Sound Transit. Retrieved December 2, 2024.

External links

• West Seattle Link Extension project page
• Everett Link Extension project page

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• v
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• v
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• 2032 in rail transport
• Link light rail
• Transportation in King County, Washington
• Transportation in Snohomish County, Washington
• Transportation in Seattle
• 1500 V DC railway electrification
• Washington (state) transportation stubs
• United States rail transportation stubs