The new Trains Magazine special issue featuring Chicago just came out. I picked up my copy at a nearby Barnes & Noble. Normally I take a pass on these publications which seemed geared to someone who is completely unfamiliar with the Chicago area but this issue is an exception.
The coverage is in-depth on the history of railroads in Chicago and the consolidation of passenger train operations over the years. It's worth the $9.95 price for the article on the Chicago Rail Link shortline alone. The photography and maps are excellent.
The only criticism is that it is tilted too heavily toward passenger train operations and especially Metra and the CTA which are extensively covered in First & Fastest as well as various websites.