Iles was torn down as part of the railroad relocation project that was completed back in October of 1994.
Ridgely Tower, amazingly enough, is still in operation in 2008! I can't figure out why the UP won't close it, but they haven't. Unfortunately, however, Ridgley just recently lost its classy color position light signals and the ex-Alton signal bridge north of the tower.
The IC's Avenue Tower also made it into the early 1990's. It was still in operation when I moved to town in 1992. I believe it was torn down in either 1994 or 1995.
As far as I know, the former C&IM Shops Tower has been closed for a long time. I wouldn't doubt that its been closed since the late 1970's or 1980's. The I&M dispatcher now controls the interlocking. It does still house electronic equipment for the interlocking and the I&M recently fixed the building roof and eaves.
NW: The Darth Vader Railway