"The way you write science fiction is: you sit down at your writing machine and you open your mind to the first thought that comes through."
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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