Agreed all around! I had a tickle in my brain that there was a "run the plot" game or two out there but couldn't remember what they were. Thanks for the reminder! You could also add Tobie Abad's A Single Moment to that list, although you can string that game's scenes together more or less however you like.
I guess it wasn't all that accurate to say "run the plot" games are railroady. I think they can run that risk... but maybe not any more or less than any other system. That is to say: the difference between guided plot and railroad may have more to do with the GM than the system.