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[–] Lurker22 ago 

"The authorized track speed in the area of the accident was 79-mph on approach to the 30-mph curve just before the bridge. A speed board (sign) was located about 2-miles before the curve. Positive Train Control is not in service on the line the train was operating on. Sound Transit reports that PTC is currently being installed, but installation is not complete.

Preliminary indications from the rear locomotive event recorder show the train was traveling at about 80-mph before a sudden reduction in brake-pipe which initiated the emergency train brakes. The reduction in the brake pipe does not appear to be engineer induced."

from that site

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[–] 11502831? ago 

Assuming they mean about 80 MPH in the 79 MPH section (i.e., normal operation), then it just means that not every investigation has an obvious cause that can be discovered in time for preliminary reports (though they may state such in an update). It still likely won't be necessary to wait for the final report (which can take years) to obtain the cause and recommended safety information, though. The article makes it sound like the NTSB is holding everyone hostage and refusing to release pertinent information until the very end, which isn't the case.