While I've never traveled this section of track, it looks interesting on Google Earth and various maps. It's located about 44 miles north of the Chemult OR station:
DoubleLoopOakridgeORFRA.jpg
From Cruzatte to McCredie Springs, the track drops almost 2000 feet in a distance of about 24 miles and goes through 15 tunnels along the way. The area is heavily forested, so I don't know what can be seen from the train. It could be one of the sections that looks more interesting on a map than from the train. Maybe someone here knows if it's worth looking for.