Dear European that has never been to America, let me explain to you how fucking BIG our country is, compared to your entire Continent.
http://i.imgur.com/Eldeh.jpg
Your Puny countries are easy to build trains for. Ours is as big as most of Europe, and the entire Mediterranean sea (which have no trains, only boats). Extrapolating your small countries problems to a geography the size of the USA doesn't work. Yes, Geography matters.
Or let me put it this way, get on a train in Belgium and go to Israel. Go on, I dare ya. Oh wait, you can't!
So, in conclusion, your ideas about how to scale trains, is so fucking adorable.