Thanks, everyone, for the interesting information! I ran across this thread while researching Zook Spur for a discussion on the Forgotten Iowa: Hawkeye State History group on Facebook.

And, to pagliaihawaii: I live in Iowa City and I love your family's pizza! I also just discovered this: “Childhood Remembrances” by Josephine Pagliai, a former Madrid resident on madridiowa.org
I'm guessing she's likely related to you.
Cheers!