The sense I have is that, first of all, the rail corridors are in place, and the infrastructure that exists seems to be answering to the demand.
The question links a bit to what I was saying earlier—that if indeed there is a significant increase in demand, everything is there and available. It would be just an incremental improvement to what you already have in order to meet that demand. This is how I would see that picture. It's that the railways would be present and ready to support traffic to the east coast.