So the cars aren't on the ground...
I live north of Seattle. My wife was driving south on I-5 when this happened (She was not near the accident.)
The situation is very bad. The media has a dramatic photo of one of the cars hanging off the overpass onto I-5, but that is only part of the disaster.
The engine made it past the overpass, and the car immediately behind the engine seems to be mostly on the tracks. The third car is dramatically hanging down onto the freeway.
A passenger who was on the train says at least 7 cars derailed. The train was going 80 miles an hour when all passengers were thrown into the seat in front of them. I don’t know how any of them could avoid serious injury from that, but apparently some did.
If you look closely at the pictures that are currently being shown you can see what appear to be at least two cars on the ground in addition to the one that’s hanging, and the media is saying there is an upside down car on the freeway.
The accident occurred at rush hour on a very busy freeway. It seems certain that many motorists would have been injured, and I don’t see how anyone could survive having a train land on their car.
However, if traffic was going at usual rush hour speed for that location, people who ran into one of the train cars that suddenly dropped on the freeway might not have even been injured.
I’ll be away from my computer for the rest of the day, so no more updates. It’s too soon to know many details, but do not assume this was minor.