The whole point of HSP rail so connect the different rail-system and serve a backbone between the northern and southern rail systems. If you want to be serious

The whole point of HSP rail so connect the different rail-system and serve a backbone between the northern and southern rail systems. If you want to be serious about rail, having a such a backbone makes sense. Of course, you need to continue improving regional rail as well. And as far as I know, California has been trying to do that too.