This cache is placed on the Prarie Path, location of the old Chicago, Aurora, and Elgin Interurban Line. When looking, keep an eye out for the remaining artifacts and quirky treasures left behind from a time long passed, and see how nature has slowly been reclaiming the area.
Cache is a micro magnetic, but hopefully shouldn't be too hard to find.
EDIT (7-19-15) - I raised the difficulty and terrain level on this cache due to the many DNFs it was getting. Keep a keen eye; it is there.