How far can you go by train in 5h?
As a European it boggles my mind seeing how trains are basically non-existent in the USA (just look at Houston station), given how dominant the whole "Wild West" railroad rush is in everybody's immagination. Railroads are super ubiquitous here, and we've to work with a pretty hostile terrain - Italy has lots of mountains, hills, rivers, and yet has one of the best networks in the world. Most of the USA are basically empty, it would be pretty easy to build high-speed rail.