The picture below shows where the train came to rest. The lead locomotive is the one at the very top of the frame, now sitting on I-5. This is a good 30-40 feet down below the tracks. I would not be surprised if at some point the lead locomotive had been airborne, especially if it was doing 80 mph. I don't believe the train cars are new and the route is not new either, just the passenger sevice. It is being reported that the tracks at this curve were recently upgraded and other images appears to confirm this. The Talgo cars or "consist" also have two unique cars at each end. These can be identified by curved parts going above the roof of the car always toward the engine. They always make me think of Cadillac fins from the 50's. If you look at the picture below, there is one still attached to the trailing locomotive. The other laying on it's side on the south side of the trestle, partly resting on the freeway. There is another picture being posted which shows the top of the lead locomotive appears to have been peeled from the back towards the front. It makes me wonder if the second car was on top of the locomotive at some point during the accident. I cannot say for sure that the lead engine didn't hit something before the derailment, however, when the train derailed, it did hit cars and trucks that were traveling on the freeway.
I live in Seattle and have been past this part of the freeway many, many times. My sister and her carpool past this trestle less than 3 minutes before the accident. Many prayer for everyone involved.