Burlington Northern Santa Fe spokesman Gus Melonas said Saturday that a 48-hour moratorium on passenger and commuter train service is now being extended indefinitely.
He said engineers are worried about safety due to more than 10 mudslides that have hit tracks in recent days. He said crews will assess the situation day by day.
One of those mudslides derailed seven cars of a Burlington Northern Santa Fe freight train just south of Everett on Monday, in the same area where a slide covered the tracks earlier in the day.
More slides hit the tracks later in the week - including eight on Thursday alone - making this one of the worst years for mudslides there in the past 20 years.
Freight train traffic is moving through the corridor at restricted speeds.