Here is the Chicago NorthWestern in 1992. In 500 pages, the CNW “Regional Engineer: East Territory” covers CNW lines in Illinois, Wisconsin and Minnesota and then Nebraska and into Wyoming. The East Territory covers the CNW with the exception of the Suburban Territory commuter lines near Chicago and the Iowa and “Spline” lines.
This is a scan of an original Chicago North Western track chart. Included is a key, an index, list of subdivisions and a list of stations. A track chart shows every mile of track including curvature, signals, tunnels, grade (profile) and more.