What region you think would benefit from low capacity regional rail?

Im in LOVE with these lo capacity local regional lines from japan, i know they are not as profitable as high density transit but...

What region/corridor/place would you love to see this (idealistic not realistic tbh)? I would love that in (personaly i would like to see it in the american continent):

Cascadia/oregon North East USA/Vermont Colorado Central USA/ Nebraska-ish Central Mexico/Edomex Quito Ecuador