News releases

Sound Transit service changes taking effect September 19 and October 2

​​​​​​​October 2 service changes happening with opening of Northgate Link; September changes include additional Sounder South trips

Publish Date

Sound Transit riders will see significant changes in service in the coming weeks, starting on September 19 and culminating with the opening of Northgate Link on October 2.

In addition to service changes, riders will see changes in the way that Sound Transit lines are named. Link becomes the 1 Line, Tacoma Link becomes the T Line, Sounder South becomes the S Line and Sounder North becomes the N Line. 

The opening of the Northgate Link extension on October 2 will add three new stations in North Seattle, including Northgate, Roosevelt and U District. As a result of the opening, southbound ST Express buses on routes 511, 512, and 513 will now end at Northgate station. ST Express route 522 will now end at Roosevelt Station. ST Express routes 542 and 556 will end at the U District Station. Riders on these routes can then transfer to the 1 Line to reach their final destination.

October service changes

510 – Everett to Seattle: Adding stop at Mountlake Terrace Freeway Station to allow transfers to 511/512/513 for access to Northgate Station. Route 510 continues to Downtown Seattle for those who do not wish to transfer. Effective Monday, Oct. 4.

511 – Ash Way to Northgate: Route ends at new Northgate Station, frequency increases. Effective Monday, Oct. 4.

512 – Everett to Northgate: No longer stops at NE 145th Street Freeway Station and NE 45th Street Station. Route ends at Northgate Station, frequency increases. Effective Saturday, Oct. 2.

513 – Seaway Transit Center to Northgate: New stops at Ash Way and Lynnwood Transit Center. Route ends at Northgate Station, frequency increases. Effective Monday, Oct. 4.

522 – Woodinville to Roosevelt: Route ends at Roosevelt Station, weekend frequency increases. Effective Saturday, Oct. 2.

532 – Everett to Bellevue: Schedule adjustments. Effective Monday, Oct. 4.

535 – Lynnwood to Bellevue: Restore midday frequencies to 30 minutes. Effective Saturday, Oct. 2.

542 – Redmond to U District: Route ends at U District Station. Effective Saturday, Oct. 2.

556 – Issaquah to U District: Service restored between U District Station and Issaquah via Bellevue. Service operates in peak periods every 30 min, Monday through Friday. Effect Monday, Oct. 4

September service changes

Changes to Sounder and ST Express bus routes operated by Pierce Transit will be implemented on Sunday, Sept 19 and Monday, Sept. 20. These include the addition of a roundtrip on the S Line. Train 1507 (2:35 p.m. from Seattle to Tacoma) and its corresponding reverse train (1520, 4:06 p.m. from Tacoma to Seattle) will be restored on Sept. 20, 2021.

 In addition, ST Express routes 580 and 596 will each have a trip added to coincide with the restoration of S Line Train 1507. ST Express route 578 will add a late evening weekend departure from Seattle. Other ST Express routes will have minor adjustments to travel times.

Riders can find more information about the service changes, including how to transfer from ST Express buses to Link, at

All Sound Transit passengers must wear face coverings in compliance with the federal Transportation Security Administration (TSA) mandate.

A language line is available to provide translation assistance for limited English proficiency persons at 800-823-9230.

Sound Transit remains committed to working closely with its partners to continue serving the public. Efforts will continue to prioritize serving riders who depend on Sound Transit’s services, including seniors, people with disabilities, Title VI protected populations (race, color, national origin), low-income and limited-English-proficiency populations.

Riders can sign up to receive automatic email service alerts for Link light rail, ST Express, Tacoma Link, Sounder Seattle-Everett and Sounder Seattle-Tacoma/Lakewood. Rider Alerts provide information about schedule changes and help riders plan trips around inclement weather. Just go to