To learn about Sound Transit's current and planned projects explore the new System Expansion interactive map. This website is no longer being updated.
The Sound Transit 3 Plan adds 62 new miles of light rail with stations serving 37 additional areas for a regional system reaching 116 miles. The plan also establishes BRT on I-405/SR 518 and SR 522/NE 145th; expands capacity and service of the Sounder south rail line; includes ST Express bus service; improves access to stations for bicyclists, pedestrians, drivers, and pick-up and drop-off services, and expands parking at stations.
Rigorous independent oversight along with demanding internal cost and project controls helps ensure that Sound Transit spends taxpayer dollars wisely. This includes:
This discipline, which has helped Sound Transit deliver major projects such as University Link and Angle Lake extension on or ahead of schedule and on or below budget, will continue through ST3.