to come into existence. The system of train tracks was built to an extremely strong and durable degree, to allow the train to become larger and faster than any ever built before by humanity. The flaw in the tracks is that, at taproot level, it assumes some semblance of good faith.
That good faith was tossed aside once (The American Civil War), but the train and its tracks, whilst derailed and ripped apart, was not so large that one side, a stronger side (The North) could not extend itself, and set the train back upon the tracks, after they were repaired.
NOW, however, the train is so fast, so large, so intertwined with so many variables (both internal and international) that when good faith is tossed aside again (by the Regugs), that the force of derailment, the damage done to the tracks and the train will be exponentially worse. There also are now far more weapons (at every level, both kinetic and psychological) with which to bring forth sheer destruction and atomisation.
The bigger they are, the harder they fall.