Railfan and Railroad had a nifty 3-page article with photos on the CTA freight service by Walter Weart in the February 1988 issue. Without referencing any specific names but Lill Coal Co. (the last major customer), it mentioned \"several coal yards, a warehouse, two power plants, a lumber yard [at Howard St.] and a team track.\" It also mentions the lumberyard closed after burning to the ground(!)
I also know from another source (which I apologize for having totally misplaced) that there was track in Evanston installed to deliver fuel (either heating oil or gasoline, don\'t remember which) dating from the 1940\'s or thereabout, but it apparently never saw service--I think this was different from the fuel oil traffic Tom mentioned. It also appears that the Milwaukee initiated the abandonment petition, not the CTA, and that the remaining customers were not happy with the decision.
Oh...and the article mentioned something about CTA interchanging cars from the Milwaukee at Buena Yard and handing them over to the North Shore in Skokie until the 1930\'s.
Hope this helps!