The northeast US is also dense with abandoned lines that can never be rebuilt. I assume they are not on the map because they've been built on top of or otherwise completely ripped up.
Rails to trails is actually a (somewhat subversive) way for rail right-of-way to be legally preserved.
From a practical/political standpoint, it'll be interesting to see the backlash when a railroad attempts to start exercising its right to reclaim some of these properties, which are largely and falsely believed to have become community property.
