There should be a website where you can design your dream US railway network, then upload it and share it with others. You could comment on designs and rate them, complete with top ten lists.

Maybe have different categories for the number of railways (or maybe distance? (both?))?

So you'd have the "most highly rated with 10-50 connections" vs "most highly rated with under 200,000 miles" and so on.

I dunno. I think it'd be fun.