1. No-one comes round trying to flog you a scratchcard
Train travel is a largely uninterrupted experience. Go by plane and you'll inevitably be required to decline the offer of overpriced food and drink, duty free goods and even in-flight scratchcards.
2. Or to nag you about having your tray table stowed...
...your seatbelt fastened, your window blinds open, your laptop off or you headphones out.
3. You get views like this...