Given that we already have roads to every residence, the amount of earth moved, steel smelted for tracks laid and additional fuel to run throughout the country, I dont see trains everywhere being a net positive.

Through some dense urban states, yes, but most of the sparsely populated rural states would see them barely used and lots of additional habitat disruption.

We have industrial train tracks near us. Literally noone is clamoring for residential trains here. Even within the nearest city, a 20 minute drive from one popular destination to another becomes an hour and a half excursion if you wanted to take light rail instead.