Along with a reputation for writing books that sold, she also gained a reputation for casually dropping inflammatory comments in interviews on everything from women's suffrage (wasn't impressed by it) to care of children (thought that they were less important than spouses) to reincarnation (dabbled in past lives therapy without entirely committing to its being really possible) to her views on the human race (said once that human beings were God's big mistake). She was vehemently anti-Communist and highly suspicious of big government. You can see her FBI file online; she repeatedly claimed to be harassed by Communists (which is probably true in the limited sense that outspoken authors tend to be harassed by kooks opposing the positions they take) and the Internal Revenue Service, which she regarded as an instrument for the usurpation of power and the control of the populace. But it's always difficult to determine how much of this side of her was utterly serious and how much of it was dramatic hyperbole. Probably a bit of both, since there is no doubt that she put a high value on saying things frankly and yet also relished controversy. It's also true that expressing herself very vividly is something at which Caldwell excelled.
I've read a lot of her works, but the fortnightly book is one I hadn't read before. It is on my shelves as an inheritance from my grandparents' library, but they had it as an inheritance as well, since it has the name of my great-grandmother (my mother's mother's mother) inside the cover. Never Victorious, Never Defeated was a bestseller for 1954. I know very little about it, beyond the fact that it is about the railroad industry in America between the Civil War and (I believe) World War II. It is usually paired with Captains and the Kings (which I have read and have on my shelves, and which is quite a good book). It is sometimes compared with Ayn Rand's Atlas Shrugged, but I doubt beforehand that there is more in common between the two books than the railroad industry and a suspicion of big government -- we will see.
On the title page, Caldwell has placed a poem, her own, explaining the title:
Man is never victorious, never defeated,
The cheater yields up his loot to the cheated,
Wisdom and folly can never be parted,
The waters return to the hills where they started.