(gee, everybody thinks I'm making all this stuff up. Even when it's printed in the article that the 'manager' of the run is likely to blame-meaning he told the engineers to ignore the speed limit in order to prove that they could beat the old route by 10-15 minutes).
Anyway, here is where AMTRAK tells how they know the train was doing 81 MPH.
Amtrak train going 81 mph just before derailing around 30-mph curve; 3 dead
First reports were that something on the rails derailed the train. In the interests of national security, changing the story to excessive speed would work just fine. Afterall, if the public can be fooled into ignoring the Las Vegas Massacre ( how many moons ago was that?) they can be fooled into thinking ANTIFA did not cement boot the tracks. ANTIFA has been bragging about doing exactly this in Washington State.