Telephone toll plant in the Chicago region

This paper described the telephone toll system in the region within a radius of about 50 mi. from Chicago. In this system have been established 21 toll centers at which are handled the toll traffic of their own exchanges and 95 other exchanges in the area. Descriptions are given of the toll plan and the toll plant, methods of handling toll calls, volume of traffic handled, etc. A most important consideration is the very rapid growth taking place in toll-service requirements in this region.