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 a cash fare receipt for Norfolk & Western (now Southwest Service), a ticket for Illinois Central Gulf (now Heritage Corridor), a ticket for Penn Central (former commuter line to Valparaiso, Indiana), and various cash fare receipts from the South Shore Line, or Northern Indiana Commuter Transportation District. The Penn Central ticket form is a booklet with ticket coupons inside, almost like an airline ticket. Although many people would question the sincerity of the "It's our pleasure to have you aboard" statement coming from Penn Central.