Here is the Chicago NorthWestern in 1992. In 372 pages, the CNW “Regional Engineer: West Territory” covers CNW lines in Iowa and the “Spline Line” to Kansas City. This is a big chunk of the CNW, with 31 subdivisions covered. The West Territory covers the CNW with the exception of the Suburban Territory commuter lines near Chicago and East Territory lines in Illinois, Wisconsin, Minnesota and then Nebraska and Wyoming.
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.