Sound Transit breaks ground on Stride S3 Line
February 27, 2026
Today, Sound Transit and project partners celebrated the groundbreaking of Sound Transit’s Stride S3 line. S3 will connect communities along SR 522 with fast, reliable, battery electric bus service from Shoreline South Station to Bothell via Kenmore and Lake Forest Park.
The project will deliver 14 new stations featuring real-time arrivals information and large, comfortable shelters. The S3 line will be operated by a fleet of 15 60-foot battery electric buses. The project will also feature new BAT lanes, sidewalks, plantings, and intersection improvements along the corridor. S3 will operate every 10-15 minutes up to 19 hours a day with transit signal priority and infrastructure improvements that will cut travel times from up to 59 minutes today to as low as 35 minutes when the project is complete.
“Stride represents the next generation of multimodal transit, connecting communities and people across the region,” said Snohomish County Executive and Sound Transit Board Chair Dave Somers. “We know a truly effective mass transit system must go to where people are and take them where they need to go. Stride, Link, Express buses, and Sounder service all work together to get people out of their cars and off to work, play, home, or just explore.”
“Breaking ground on the Stride S3 line is an exciting step forward for regional mobility and providing fast, reliable transit to our growing North King County communities,” said King County Executive and Sound Transit Board Member Girmay Zahilay. “Transit is becoming more multimodal as Sound Transit and King County Metro work together to expand service, and Stride S3 will further enhance east-west connections. We are proud to work together closely with Sound Transit as we continue to raise the bar on transit service in this area and across our county.”
https://www.soundtransit.org/get-to-know-us/news-events/news-releases/sound-transit-breaks-ground-stride-s3-line