[patmcguire]

The hard part is how to make it work politically. I don't know if any place has really done it in an environment that was mostly built out already. Manhattan used to have 700k more residents than it does now, and that was when a lot of the island was still farmland - people spread out with the trains. Once you're out of space it's very difficult to develop transit, because that would probably mean a homeowner doesn't get what they want.