System expansion

Voters approved projects in 1996, 2008, and 2016. Sound Transit is building the most ambitious transit expansion in the country.

KEY

New service
Parking & access
Operations & maintenance facilities
Link light rail
Sounder rail
Stride bus rapid transit

Expansion projects

Regionwide updates 

Fall/Winter Progress Report 

Light rail expansion projects are moving forward! Learn the latest on Link, Sounder, and Stride bus rapid transit progress near you and see how Sound Transit is working to make every ride feel more safe, clean, and welcoming for everyone. 

Latest project updates

October 16, 2026
Stride S3 Line, Stride bus rapid transit

Long-term eastbound lane shift on SR 522 in Bothell

October 16, 2026
Everett Link Extension

Be part of the conversation

The Platform

The heart of Sound Transit’s mission is to provide the people of the Puget Sound region with an effective, affordable, and reliable public…
When the 2 Line Crosslake Connection opens on March 28, riders will not only experience a more connected region. Public art installations at the two…
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Latest project documents

Everett Link Extension

Everett Link Extension - Community Guide to the Draft EIS

(PDF Document | 574kB) Updated 10/16/2026

Public outreach, Reports, Tacoma Dome Link Extension

Tacoma Dome Link Extension Engagement Report, Q1 and Q2 2026

(PDF Document | 576kB) Updated 10/08/2026
See all project documents
See all project documents