"Individual science fiction stories may seem as trivial as ever to the blinder critics and philosophers of today -- but the core of science fiction, its essence has become crucial to our salvation if we are to be saved at all."
The basic idea for a magnetically-levitated train was developed years earlier - so, this is not a Heinlein idea.
You can see that this idea was set forth in a remarkably similar form decades earlier in Modern Mechanics and Inventions from 1931.
(Magnets Drive High Speed Suspension Trains Thru Air)
Thanks to Winchell Chung for this item.
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