3 Line (Sound Transit)

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.

3 Line
Overview
StatusPlanned
OwnerSound Transit
LocaleSeattle metropolitan area, Washington, US
Termini
Stations25 (9 new, 1 provisional)
Service
TypeLight rail
SystemLink light rail
History
Planned opening2032 (West Seattle)
2037 (Southwest Everett)
2041 (Downtown Everett)
Technical
Number of tracks2
CharacterUnderground, elevated, and surface
Track gauge4 ft 8+12 in (1,435 mm)
Electrification1,500 Volts DC, overhead catenary
Operating speed55 miles per hour (89 km/h)
Route map

Provisional route
Everett (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
Existing segment
Mountlake Terrace
Shoreline North/185th
Shoreline South/148th
NE 130th Street (2026)
Lynnwood Link extension (2024)
Northgate
Roosevelt
U District
University of Washington
Montlake Cut
Capitol Hill
to Ballard
Westlake
University Street
Pioneer Square
International District/
Chinatown
(2024)
Stadium
reroute
SODO
West Seattle Link Extension (2032)
Delridge
Avalon
Alaska Junction

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.

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