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.
Those reports were from bloggers and the media who were 'surmising' that theory.
In the interests of national security, changing the story to excessive speed would work just fine.
Except for the fact that the train was doing 80mph. All the evidence and witness testimony supports that.