Yes, Virginia, there are other sectors of our economy besides petroleum:

http://www.bloomberg.com/news/2014-10-31/buffett-railroad-s-shale-focus-blunts-ports-comeback-bid.html

Biggest argument yet for disinterring William McAdoo's body, cloning him, and putting him in charge of the nation's railroads. It was precisely the problem of freight cars pooling up at East Coast port cities, that forced the government to create the USRA.

http://en.wikipedia.org/wiki/William_Gibbs_McAdoo