Last summer, during the thread, Is Amtrak Crash Nevada’s Fault?, I had some communications with Nevada DOT, and I was told that they were committed to public communication on the accident regardless of the legal ramifications. After I sent them my analysis showing a total warning for the truck driver of 2.9 seconds, they did not answer any further communications from me.
My point in that thread was that 70 mph speed limit, combined with such a heavy truck, resulted in a crossing with insufficient warning time.
The engineer of the Amtrak train involved in the collision agrees with my conclusion, and he has publicly said so.