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Mayhap it was "put in" in a later draft of the screenplay. We will have to wait and see

It was taken directly from the Choo-Choo story in The Waste Lands, so it was written by King. In a sense, it's a King book or an excerpt

Hmmm, can't find any info on King writing a short intro for the rerelease...but it would make sense that the blurb from the cover comes from that