Overton Transcription discs are blue flexible discs produced by Richard C. Overton, author of the history Burlington Route. They are interviews with employees and officials of the CB&Q, as well as readings of chapters from his book, all used to compile the history of the company. Selections have been digitized and are available on mp3 format.

Pioneer Zephyr Radio programs are air check recordings made on 78 rpm radio transcription discs, both aluminum- and glass-based by companies that provided this service for advertising agencies and their clients. They were transferred to audiocassettes in 1998 and 1999; and digitized and transferred to compact discs in 2004. A more detailed description of the radio programs is available inside the container.