Sound Transit says Sounder commuter train service in that corridor will resume Thursday morning.
Burlington Northern Santa Fe said a safety moratorium for mudslides expired at 3 p.m.
Spokesman Gus Melonas said a dry spell has stabilized slopes that were saturated by 28 days of rain in December.
The section of tracks along Puget Sound between Seattle and Everett has been hit by 72 "blocking events" since Thanksgiving.
Crews had been able to quickly remove mud and vegetation to clear the tracks for freight trains. Amtrak and Sound Transit Sounder trains observe a 48-hour moratorium to make sure the tracks are safe.
Passengers are carried by bus when trains are on hold.
A mudslide on Dec. 17 just south of Everett hit a freight train and derailed seven cars.
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