System expansion

With voter approval in 1996, 2008 and 2016, Sound Transit is building the most ambitious transit expansion in the country, with new service opening every few years.

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Auburn Station Parking and Access Improvements

Status: Design phase

Improving station connections and adding parking.

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Bus Base North

Status: Design phase

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

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Downtown Redmond Link Extension

Status: Construction phase

Extending East Link to downtown Redmond.

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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: Design and construction phase

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Hilltop T Line Extension

Status: Complete phase

More than doubling the length of the T Line.

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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 phase

Improving station connections and adding parking.

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Lynnwood Link Extension

Status: Construction phase

Connecting Snohomish County with light rail.

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North Sammamish Park-and-Ride

Status: Planning phase

Providing transit parking for Sammamish residents.

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NE 130th St Infill Station

Status: Construction phase

Adding a station to the Lynnwood Link Extension

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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: Planning phase

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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 Boeing Access Road Infill Station

Status: Voter approval phase

Serving Boeing Field & north Tukwila neighborhoods

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South Graham St Infill Station

Status: Voter approval phase

A new station between Columbia City and Othello

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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 and adding parking.

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Stride S1 Line

Status: Design 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: Design phase

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

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Stride S3 Line

Status: Design 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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TCC Tacoma Link Extension

Status: Voter approval phase

Extending Tacoma Link from Hilltop area to TCC.

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Tacoma Dome Link Extension

Status: Planning phase

Connecting to Pierce County with regional light rail.

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West Seattle and Ballard Link Extensions

Status: Planning phase

Serving regional jobs, entertainment destinations.

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

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Project phases: Plans to construction

Explore project phases

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.

Explore project phases

Building the system

With voter approval in 1996, 2008 and 2016, new light rail, bus rapid transit and commuter rail service will come online every few years.

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Creating vibrant stations

We're building welcoming stations with public art and sustainable design, so they become attractive destinations for people to live, work, shop and easily connect.

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Planning future service

Our region and transit system are growing rapidly. It takes a lot of planning and community involvement to make sure we're responding to community needs as we grow.

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Innovation and technology

Technology is rapidly changing and we're committed to investing in research, testing and implementation of tools and services that will keep our system operating for decades to come.