Burlington Northern Santa Fe spokesman Gus Melonas said the mudslide struck at about 4 a.m. Friday a little more than two miles south of Mukilteo.
Freight train traffic resumed later in the morning, but passenger rail service is subject to a 48-hour moratorium any time there's a mudslide by the tracks.
Passenger service was already suspended by a slide north of Mukilteo on Thursday afternoon, but Friday's slide means service won't resume until Sunday morning at the earliest.
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