Train travel is so great, even in the crappy trains. Just turn up at the station, sit down, and enjoy the sights. You don't even need a seatbelt.
I wish to see high speed maglev transportation to supplant air travel in my lifetime.
Or maybe just change our habits, travel less and slower.
In practice, those are two different types of train travel. The former exists only in countries with a rail heritage. Where countries are genuinely trying to replace air travel with high-speed rail (credit to them, it's much more sustainable), the new train stations are alas a bit like airports for trains. You generally can't just turn up and hop on. In China you can't even get into the train station without a booking.