Hussar
Legend
ALL PLOTS ARE RAILROADS!
I mean "plot" in the literary sense, changing the referee into Author and the players from those of a game to those who strut upon a stage -- not in the sense of the plans of NPC mice and men.
It seems to me really not hard to grasp, based on my experience of D&D in the 1970s and 1980s.
It blows my mind that the basic concept of D&D should (in such precincts as these) be probably even stranger than swimming in the ocean is to one who has never known anything but plains beneath the Big Sky.
EDIT: Basically, this seems to be getting "thought about" to an absurd degree. Instead of debating a spectral analysis of chocolate ice cream, my advice is to give it a taste. Then you might know the difference between it and carob-flavored soy milk by way of information processors in development long before photography!
But how do you differentiate between Authorial plot and NPC plot? I mean, both are 100% generated by the DM. And, if they are the same, then railroad should have no negative connotation, but it does.
Let me give you an example. Is there any difference between the DM saying, "There is a plot by Baron McBaddass to take over the kingdom by killing the king" and "Baron McBaddass has decided to take over the kingdom by killing the king"?
You are make a distinction here that I don't think holds any water. There is no difference between Author and NPC, they are both the same person.
Again, I agree with you that I know railroading when I see it. But, trying to nail down an objective definition is far more nuanced than you seem to be attempting.