WSJ today, front page of the Marketplace section. It's behind a paywall, but key points:
BNSF Railway Co., one of the country's biggest consumers of diesel fuel, plans this year to test using natural gas to power its locomotives instead.
If successful, the experiment could weaken oil's dominance as a transportation fuel and provide a new outlet for the glut of cheap natural gas in North America.
...
"This could be a transformational event for our railroad," BNSF [CEO] said of the plan, which hasn't been publicly announced. Shifting to natural gas would "rank right up there" with the industry's historic transition away from staeam engines last century, he said. ...
BNSF, the largest railroad in the U.S., estimates it is the second-biggest user of diesel in the country, after the U.S. Navy.