SEATTLE — A mudslide has hit railroad tracks that run along Puget Sound under a bluff about three miles south of Mukilteo.

Burlington Northern Santa Fe spokesman Gus Melonas says the slide at 3:20 a.m. Tuesday is the biggest of 13 this rainy season in the region. It’s about 150 feet long and covers both sets of the double-main line tracks about 15 feet deep in mud, rocks and trees.

Melonas says crews expect to clear the tracks by noon so that freight trains can resume rolling. But Amtrak and commuter trains between Seattle and Everett must observe a 48-hour safety moratorium. They can resume service early Thursday, if it’s safe. Rail passengers are bused in the meantime between Seattle and Everett.