I haven't sat down and done the math, but I'd imagine that if you compared the energy cost of counteracting lift induced drag, it would account for a larger portion of the operating cost of an airplane than the energy cost of counteracting rolling resistance does for a train. Assuming that is the case, it's less important for trains to minimize weight per passenger than it is for airplanes to do so, and space/comfort is directly related to weight per passenger.
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I haven't sat down and done the math, but I'd imagine that if you compared the energy cost of counteracting lift induced drag, it would account for a larger portion of the operating cost of an airplane than the energy cost of counteracting rolling resistance does for a train. Assuming that is the case, it's less important for trains to minimize weight per passenger than it is for airplanes to do so, and space/comfort is directly related to weight per passenger.