Yeah, buddy! Imagine what the price of diesel could do with an extra 1.3 billion gallons released back to the marketplace.
Just to keep us in reality, it would take many years to convert all of their locomotives to LNG, and that 1.3 billion gallons represents ~2% of the US diesel/fuel oil market.
http://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=PET&s=MDIUPUS1&f=A
Still a good thing, but this alone isn’t going to send prices falling far and fast. But every bit helps.