Spokesman Gus Melonas says passenger train runs will be on pause until Monday, unless conditions improve.
Heavy rain soaked the Puget Sound region on Friday and Saturday, pushing mud, rocks and debris onto track sensors.
Melonas say freight trains continue operating.
Passenger train service has been significantly disrupted between Seattle and Everett over the past ten days because of rain.
Commuters can check soundtransit.org for updates.
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