Amtrak's"Black Hawk" connected Chicago with Dubuque, Iowa from February 1974 through January 1981. This is the timetable folder issued at the beginning of service.

A page from a December, 1935 issue of Broadcasting magazine, with an article and picture showing an advertising sign for KRNT Radio, Des Moines, on the dash of a Des Moines Railway streetcar.

Chicago and Northwestern system employee timetable number 1, in effect on October 29, 1972. By this time, the C&NW had absorbed the Minneapolis & St. Louis, the Chicago Great Western, and several Iowa shortlines. However, the Wyoming coal line hadn't yet been built, and it would be almost a decade before the acquisition of the Rock Island's Twin Cities-Kansas City mainline.

The maintenance manual for the ubiquitous EMD SD40-2. This manual covers all parts of the locomotive except the 645E3 prime mover. A manual for the engine can be found at http://www.rr-fallenflags.org/manual/emd645e.html

Published in 1959, this is a manual issued to station agents and other station employees of the Milwaukee Road (Chicago, Milwaukee St. Paul & Pacific). I'd imagine that it's similar to manuals issued by other railroads in that period.