For a few feet you would see the rails and sleepers and gravel in broad daylight; then there would come a place where they were in twilight; and then, pretty suddenly, but of course without a sharp dividing line, they would vanish altogether into smooth, solid blackness.
There are no more uses of "twilight" in the book.
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It is a beautiful picture taken in twilight.
I awakened to a twilight sky, but did not know if the sun was setting or rising.