The energy-efficiency of U.S. freight railroads continues to increase, rising more than 100% since 1980, according to this article. Last year, trains -- with one gallon of fuel -- moved one ton of cargo an average distance of 476 miles, according to AAR. "America can save even more fuel by shipping more by rail. If just 10% of the long-haul freight currently moving on our crowded highways were moved by rail, annual fuel savings would equal roughly 1 billion gallons," said AAR President and CEO Edward Hamberger.

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