by Passenger
Very likely not all of you have seen this yet. 
http://forgottenchicago.com/features/remnants-of-the-l/
http://forgottenchicago.com/features/remnants-of-the-l/
Another site worth mentioning is the Chicago-L site: http://www.chicago-l.org/.
It contains all the info about the history of the L, current operations, and photographs.
