The subject files of the general manager document most phases of the day-to-day operation of the railway. They include information on labor relations with train and track crews and other operating employees, including wage matters; maintenance and purchase of rolling stock, including information files on various types of equipment; maintenance of railway and structures; making up trains; acquisition and management of important supplies (water, coal, ties, and rail); electrification of certain western line sections; management of shops, lunchrooms, and other employee facilities; and the employment of railroad detectives. There are also files on the operation of certain subsidiaries: Glacier Park Hotel Company Somers Lumber Company, and the Cottonwood Coal Company.

This map, which has been encapsulated, shows the Great Northern main and branch lines. The line portions included in the 7 separate operating divisions are each drawn in a different color to indicate the boundaries of the divisions.

These subject files include reports and background files, apparently assembled during the 1930s, are related to coordination between Great Northern and other railroads, of terminals, trackage and facilities from Wisconsin to the Pacific coast.

Small volumes containing short daily entries regarding weather, activities and travels of Great Northern executives, meetings, and very occasionally longer descriptions of important events.

In-house circulars received and filed chronologically by the office of the Vice President - Operating. Most emanate from the Operating Department, especially the offices of the Superintendent and General Manager, but others come from different offices, especially those of the President and the Secretary. Circular subjects include appointments to positions, general announcements (especially new or altered regulations and methods), and new or discontinued stations and trackage.