Chicago and Northern Indiana Railroad Interlocking Towers
I learned about this junction in a posting about how much train traffic runs through Round Lake Beach on the former Wisconsin Central route. The answer is enough trains run on the route that CN is planning to double track some of it. But the trains now transfer to CN"s EJ&E at this Leighton Junction so the WC route south of here is not used much. In fact, the southern most part of the WC is out-of-service.