It would require a cohesive central government and good planning, neither of which we have. On the East Coast you’d need to exercise eminent domain to make it

It would require a cohesive central government and good planning, neither of which we have. On the East Coast you’d need to exercise eminent domain to make it work. As it so happens, a high speed line would run through a lot of seriously wealthy neighborhoods. These are the wealthiest and most politically-connected areas of the country. On the West Coast, you have A LOT of big mountains and rugged terrain, the likes of which you don’t see in the Northern European plain, and also, some other seriously wealthy (and NIMBY) neighborhoods. There are a lot of people who resisted building the BART through the peninsula and Marin. Caltrain’s already got people suiciding on it all the time, and they needed to build the high speed line through it. The commuter infrastructure isn’t really there.