by BarryM800 Thu Apr 29, 2021 11:19 pm
Upon further review, I'm gonna answer my own question. Guess I was confused by the word "unqualified." I previously only thought of the word's general meaning as "not qualified." But "unqualified" actually has a second, if not an opposite, meaning: without qualification/reservation, total. So the clause "that the railroad was an unqualified improvement" is indeed modifying the closest noun just preceding it, i.e., "prevailing attitude," and that prevailing attitude is a positive one.