It depends on the train, the plane, the number of passengers, weather and traffic conditions, and many more variables, to there is no real answer. It is like comparing apples and oranges.
However, Amtrak averages about 1.9 megajoules per passenger-kilometer.
The second link indicates US domestic air travel at 2740 Btus per passenger mile, with Amtrak trains at 2784 Btus per passemger mile, statistically identical to air travel. (2005)
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