One takeaway from this article on Amtrak's SUPERTRAIN plans is that the Northeast Corridor is just about at capacity in terms of its transportation infrastructure. A bit more population growth and the trains will be packed, much of 95 will be packed, and the airspace is already packed. Adding more capacity is going to be expensive, in part because of the cost and difficulty of expanding right of ways, no matter how we do it.
A new underground station in Philadelphia? That means a new tunnel. Crazy talk.
