IC to Lake Geneva?

I recently came across this map on ebay that shows a few "IC" lines that I have never seen before.  Namely the line from the Chicago area to about Mendota IL (via the CB&Q?) and the line from Chicago to Lake Geneva (WI).  Being from Burlington this Lake Geneva line piqued my interest.  First off, yes this is an actual Illinois Central map, dated December 31, 1920, and it is listed as "Poole Bros, Chicago" which I assume to be the printer.

Taking a close look it looks like the alignment follows the C&NW from Chicago up to Crystal Lake, and then north to Lake Geneva.  This makes me think that it was the C&NW line (and not an IC line per se) and may have been included by the IC for marketing purposes considering the tourist draw of the Geneva Lakes area.

In printing (upon close examination) it appears that there was an issue with the alignment between the black ink and the red ink.  If you look closely below all the red lines you can vaguely make out white blank areas where the red lines *should* have printed.  Not to mention that the red lines do seem offset from the correct locations of many parts of the line.