>>1136540>attempted derailmentsIf they were really trying to derail the train they wouldn't call the railroad or rig the signals to read red. They don't want to kill anyone, they want to stop the train. Cementing the tracks does that very well for at least a day as crews go and clear it/check the track to make sure it's passable again.
That is not, however, to say it's not a federal crime. They are very much committing a crime by disrupting rail service. But it's sabotage, not terrorism. Different motivations, different aims.