Found it. Here's the quote from CSX:

Everything about our operation is designed to reduce fuel consumption and improve the quality of our air. Steel wheels rolling on steel rails is the most efficient way yet devised to move goods from place to place. The fact is, our trains can move a ton of freight 423 miles on a single gallon of fuel. Can you beat that?

-Joe-

As I said in the Trainspotting thread yesterday, it sure is nice to sit in my yard and drink a beer and watch the trains go by on the First Transcontinental Railroad.