It's not about "cheaper", it could very well be "the train should not consistently be twice the price". Also in my personal experience planes don't simply get

It's not about "cheaper", it could very well be "the train should not consistently be twice the price". Also in my personal experience planes don't simply get cancelled (or replaces with one without my reservation) 1/3 of the time, which is an actually reasonably correct number for me taking trains in Germany.