Although the Regional Transportation Authority (RTA) achieved unification of Chicago's commuter railroads during the 1970's, the individual railroads continued to actually operate the commuter services, and issue the tickets. And as the 1970's progressed, the railroads began including the RTA logo on their tickets. And the railroads' many different "station to station" fares were replaced by uniform "zone" fares, with zone letters identified on the tickets. Zone A begins downtown and extends 5 miles out, with each subsequent lettered zone 5 miles long.

Shown are tickets issued at stations, along with cash fare receipts issued by conductors for fares paid on the train. The Milwaukee Road only had two ticket forms issued at stations, one for each line, and the agent would clip a notch for each of the two stations involved for the trip. In the early 1980's, prior to the formation of Metra, the "Northeast Illinois Railroad Corporation" was formed by the RTA, to operate the service after the Milwaukee Road was no longer able to.