This 6-mile Missouri Pacific line from Riverdale to Belle Plaine, KS, was abandoned in the 1980s, but remained intact until about 2006. However, ties are mostly still in the ground.
James adds: I was traveling up to Wichita a couple of weeks ago and passed by the area out of curiosity. The couple of spots I could check, I found the rails lifted as far as I could see. With the trees and it being mostly inaccessable, it is hard to tell if all tracks are gone, or just what was convenient.
Thanks to James Riley for contributing information about this route.