3 Line (Sound Transit)

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The 3 Line (colored magenta) is a future Link light rail line in the Seattle metropolitan area in the U.S. state of Washington, to be managed by Sound Transit. Under preliminary plans, the line would connect Everett and Snohomish County to Downtown Seattle and West Seattle. It would share tracks with the 2 Line from southern Everett to International District/Chinatown station and replace the 1 Line. The line is planned to reuse existing tracks that are part of the 1 Line, which will rerouted through a new Downtown Seattle tunnel to be built for the Ballard Link Extension. The 3 Line comprises two projects that were approved in the regional Sound Transit 3 ballot measure, which was approved by voters in 2016. The northern project is the Everett Link Extension, which has seven planned stations and covers 16.3 miles (26.2 km) between Lynnwood and Everett Station. As of 2026, the project is in the environmental review process and has an estimated cost of $11.6 billion. It has funding for six...

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