Rail also doesn't have taxiing time, takeoff/landing time nor baggage time. And no seat belts. I love it, but I also understand much of America is located farther apart than other countries. Yet, we should prepare for denser days.
You can bring your devices without worrying about having them inspected
True, hostage-taking is generally not a risk on rail (Pelham 1-2-3 aside), but HSR is just as tempting a target for terrorism.
Imagine a detonation that derails an HSR from elevated rail, at speed, in an urban setting.