The 8.5‑mile Lynnwood Link Extension expands Sound Transit’s light‑rail network from Northgate into Snohomish County, delivering fast, frequent and reliable service to four new stations at Shoreline South/148th, Shoreline North/185th, Mountlake Terrace and Lynnwood City Center. This $3.1 billion project dramatically improves regional mobility – connecting riders from Lynnwood to the University of Washington in just 11 minutes, downtown Seattle in 28 minutes and Sea‑Tac Airport in under an hour. Sound Transit anticipates between 25,000 and 34,000 daily boardings as the system continues to grow.
What challenges did STV address?
The extension required sophisticated systems integration, construction oversight and technical review across complex traction power, communications and signaling infrastructure. Ensuring seamless operations through densely traveled corridors demanded extensive coordination among multiple contractors, agencies and rail operations teams, with safety and reliability central to every decision.
What solutions did STV deliver?
STV, in joint venture with Mott MacDonald as Northwest Transit Systems Partners, provided comprehensive systems construction management services. This included technical review, construction management, quality assurance and field inspections for traction power, communications, signaling and train control systems. STV’s work verified proper systems integration, efficient train operations, and a safe, user‑focused experience for commuters.
How does this project benefit the region?
The Lynnwood Link Extension strengthens regional connectivity by expanding high‑capacity transit into rapidly growing communities. By reducing travel times, easing highway congestion, and supporting transit‑oriented development, the project enhances access to jobs, education and essential services across King and Snohomish counties.
Key stats and accolades
- 8.5 miles of expanded light‑rail service
- 4 new stations
- 28 minutes Lynnwood-Westlake travel time
- 25,000-34,000 projected daily boardings
