<http://schema.org/alternativeHeadline>
"One of these modes of transport can move 1 ton of freight about 484 miles on one gallon of fuel. Guess which."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/transportation/questions/which-is-more-efficient-for-freight-truck-or-train>