System expansion

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

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Auburn Station Parking and Access Improvements

Status: Design phase

Improving station connections and adding parking.

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Boeing Access Road Infill Station

Status: Planning phase

Serving Boeing Field & north Tukwila neighborhoods

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Ballard Link Extension

Status: Planning phase

Fast, reliable light rail connections residential and job centers in the Chinatown-International District, downtown, Interbay, and Ballard.

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Bus Operations and Maintenance Facility

Status: Construction phase

Adding a new bus maintenance and operations building and a parking structure for buses and other vehicles.

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DuPont Sounder Extension

Status: Voter approval phase

Adding two stations to the Sounder south line.

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East Link Extension

Status: Construction phase

Connecting the Eastside with reliable light rail.

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Edmonds and Mukilteo Stations Parking and Access Improvements

Status: Planning phase

Improving station connections and adding parking.

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Everett Link Extension

Status: Planning phase

Connecting Snohomish County jobs and housing.

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Federal Way Link Extension

Status: Construction phase

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Graham St Infill Station

Status: Planning phase

A new station between Columbia City and Othello

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Kent Station Parking and Access Improvements

Status: Planning phase

Improving station connections and adding parking.

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Lakewood Station Access Improvements

Status: Planning phase

Improving station connections.

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North Sammamish Park-and-Ride

Status: Planning phase

Providing transit parking for Sammamish residents.

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Operations and Maintenance Facility East

Status: Open for service phase

Maintaining the growing light rail fleet.

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Operations and Maintenance Facility South

Status: Design phase

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Pinehurst Station

Status: Construction phase

Adding a station to the Lynnwood Link Extension

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Puyallup Station Parking and Access Improvements

Status: Open for service phase

Improving station connections and adding parking.

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Sounder Maintenance Base

Status: Planning phase

Efficient maintenance of the growing Sounder fleet

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Sounder South Capacity Expansion

Status: Planning phase

Improving station connections and adding parking.

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South Kirkland-Issaquah Link

Status: Voter approval phase

Connecting Eastside communities with light rail.

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South Tacoma Station Access Improvements

Status: Planning phase

Improving station connections.

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Stride S1 Line

Status: Construction phase

Adding new bus rapid transit service along I-405 and SR 518 between Bellevue and Burien.

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Stride S2 Line

Status: Construction phase

Adding new bus rapid transit service along I-405 between Lynnwood and Bellevue.

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Stride S3 Line

Status: Construction phase

Adding new bus rapid transit service along SR-522 and Northeast 145th Street between Shoreline and Bothell.

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Sumner Station Parking and Access Improvements

Status: Design phase

Improving station connections and adding parking.

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Tacoma Dome Link Extension

Status: Planning phase

Connecting to Pierce County with regional light rail.

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TCC Tacoma Link Extension

Status: Voter approval phase

Extending Tacoma Link from Hilltop area to TCC.

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West Seattle Link Extension

Status: Design phase

Will provide fast, reliable light rail connections to dense residential and job centers throughout the region.

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Explore projects in our growing system. Drag the map to move it, scroll to zoom, and click a project to learn more.

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An aerial view of the bridge where light rail trains will cross Lake Washington.

Regionwide updates

Fall/Winter Progress Report

Get the latest on the three new stations opening Dec. 6, Crosslake Connection testing progress, Stride bus rapid transit, new parking garages, station lighting upgrades, and much more.

Explore our progress report

Building the system

Learn more about how Sound Transit is building one of the largest transit systems in the country.

Creating vibrant stations

We're building welcoming stations with public art, TOD, and sustainable design.

Planning future service

As our transit system grows, it takes a lot of planning and community involvement to respond to community needs.

Innovation and technology

Read about how Sound Transit uses research, testing, and tools and services to keep our system operating for decades to come.

It takes a lot of work to bring a transit project into service. Major projects often take years of public involvement, planning, engineering, and analysis. Learn about the typical life cycle of a light rail project.