In euro style fast trains, you arrive 2 minutes before, walk in, you can go have a meal, there is electricity for your laptop, there are toilets everywhere.
For any journey that can be done in 6 hours with the train, the plane journey, which would take between 1 hour and 2 hours actual flying, will take much longer.
That high speed train china built is the way to go. Planes should be used for flying really big distances, and then trains should be used to go on. The entirety of europe should be connected with trains, the U.S should have 10 major airport hubs and the rest done with trains.
Nowadays, flying is just such a bother!