Ottumwa IA 1960, J. Parker Lamb photo, Center for Railroad Photography and Art.
Also see the Superintendents’ Association of Kansas City Joint Freight Time Card 67 for outbound trains from Kansas City in 1942.
Harrison B. Decker Form 808 – Conductor Decker was working the Joint Line in 1937 and 1938. Though he was a Santa Fe conductor, due to the Joint Line operating agreement, he often worked Colorado & Southern trains.
CB&Q Official Freight Shippers Guide and Directory 1936 – very large file
Chicago & Aurora Time Card 4 8-14-1854 – a reproduction
Wx4.org has a large collection of employee timetables.
A few train consists, a freight train schematic, and industry lists are available at the CBQ groups.io group.