Regarding the rail travel efficiency, I was quite surprised when I saw it.
http://www.csx.com/index.cfm/about-csx/projects-and-par... /
Fuel Efficiency
Moving freight by rail is 3 times more fuel efficient than moving freight on the highway. Trains can move a ton of freight nearly 500 miles on a single gallon of fuel. Efficient use of fuel means fewer greenhouse gas emissions for our planet.
Fuel efficiency for trains is measured in terms of ton-miles, because the length and weight of trains varies greatly. We are constantly working to improve our efficiency. In 2009, CSX trains averaged 468 miles per gallon per ton. (Learn more at the American Association of Railroads’ website,
http://www.aar.org )
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According to (
http://www.cbo.gov/doc.cfm?index=5330&type=0 ) the efficiency of inland barges is (990 BTUs per ton-mile or 140 ton-miles per gallon on average)