The Oak Park Society of Model Engineers H.O Scale Model Railroad Club. Oak Park Illinois USA. Early April 2011., a photo by Eddie from Chicago on Flickr.
One of My all time personal favorites mongst the many Chicago railroads I grew up with, was the former Atchinson, Topeka & Santa Fe.
I lived about a mile and 1/2 north of their Corwith Yard facility on the near southwest side of Chicago during the 1960's, 70's and throughout the 1980's.
Seen here is My simulated pre 1970 Santa Fe freight train operating on the Oak Park Society of Model Engineers club layout.