It may be hard to justify a national high speed rail network, but the coasts easily have enough population density to make it work on a regional basis. The big

It may be hard to justify a national high speed rail network, but the coasts easily have enough population density to make it work on a regional basis. The big problem with rail in the US, at this point, is you'd have to build out an enormous number of track miles to make the system actually work for people who wanted to use it, and that's going to cost a lot of money and displace a lot of people.