For some trips, I would include Cadillac Escalade in the same comparison.
Living in the northeast, it takes (With early arrival time, car rentals and baggage claims) the same amount of time for me to drive from Southern Connecticut to Charlotte North Carolina as it does to fly.
And far cheaper.
No kidding...
We drive from Baltimore to West Palm (SUV) several times a year and cheaper than flying, not as fast but we have a vehicle when we get there and enjoy the family time.
When terrorists start to target rail travel, the same sort of delays you will see with planes you will see with rail. The only advantage rail has is that the turnaround times are not as fast.