I suggest joining the Burlington Route Historical Society, http://www.burlingtonroute.com/ as there is a wealth of information that individuals can help you with in regards getting information about the CZ.
Also, you can join the CBQ Yahoo group at https://groups.yahoo.com/neo/groups/CBQ/info. This is an open forum mostly geared for modelers. There are hundreds of members, and it's free. We exchange information about every aspect of the CB&Q and there is always several subscribers that have answers to every question anyone asks.
Try both and good luck.
Ray