Sounder Maintenance Base
Project map and summary
Project overview
To support reliable Sounder service and future fleet needs, Sound Transit is developing a maintenance base at the Sounder Rail Yard in Lakewood. The facility will include maintenance bays, material storage areas, offices, and other employee facilities.
In May 2026, the Sound Transit Board adopted an updated ST3 System Plan to bring the agency’s long-term financial outlook into balance. The updated plan includes full funding for the Sounder Maintenance Base project, resuming progress after the project was paused in 2020.
The project team will refresh environmental documentation, with procurement for final design planned for 2028 and construction expected to begin shortly thereafter.
Once complete, the facility will play an important role in supporting expanded Sounder operations and fleet maintenance.
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Brake pads are replaced on a Sounder train.
Air filters are replaced on a Sounder train.
