Various documents I've accumulated over the years which might be of interest
"Restructuring leaves barely a bump on IC's Mainline" Article from Chicago Tribune Business Section, September 6, 1988, (PDF)
"Vistas Of Mid-America" A brochure given to passengers on the City of New Orleans. This one is from 1957
"End of the line for Central Station" Article from May 1972 Illinois Central Magazine (PDF)
Passenger Train Schedules between Chicago and New Orleans October 26, 1958.
General Motor's "Train of Tomorrow" toured the country in the late 1940's and early 1950's.
September 28, 1947 Time Tables
"Office Car One" Brochure - given out at appearances of the Illinois Central Office Car.
"IC's Microwave: Planned for Profit" - Reprint from May 1967 Railway Age about IC's bew "Main" computer system.