Does anyone have a large map showing the lines and yards in the Chicago metropolitan area of the "pre-mega-merger railroads" (when we had Burlington Northern, CNW, Union Pacific, Santa Fe, Southern Pacific, CONRAIL, and others that just yesterday never seemed like they would be fallen flags?) I'm looking at current maps, but can't discern which lines and yards belonged to which railroad in the days before the 1990s merger-mania. The most recent SPV Atlas book I have doesn't help, as it gives an overview of today's ownership and is difficult to understand the heritage of many lines. Please let me know if you can be of help in providing any sort of map or graphic that can help me gain some clarification on this. Thanks!