1924 - Kankakee-Grant Park Bus Line introduces bus service between those towns, via Momence. E. N. Betourne Bus Line introduces bus service between Kankakee and Watseka, also via Momence.
1927 - Bus service between Chicago and Kankakee introduced by Illinois Roadway Lines, controlled by South Suburban Motor Coach.
1928 - E. N. Betourne Bus Line extended south to Danville.
1929 - Kankakee-Grant Park Bus Line extended north to Beecher. South Suburban Motor Coach acquires control of Kankakee-Grant Park Bus Line and E. N. Betourne Bus Line. Through bus route formed between Chicago and Danville, jointly operated by the South Suburban Motor Coach subsidiaries Illinois Roadway Lines, Kankakee-Grant Park Bus Line, and E. N. Betourne Bus Line. Service between Kankakee and Momence assumed by Safe Way Lines, a new South Suburban Motor Coach subsidiary.
1930 - E. N. Betourne Bus Line restructures Chicago to Danville intercity service to include dedicated buses operating north of Momence to Chicago, not carrying local passengers. South Suburban Motor Coach would continue local operation north of Kankakee, consolidating subsidiaries Illinois Roadway Lines and Kankakee-Grant Park Bus Line into the main company.
1932 - E. N. Betourne Bus Line sold to Southern Limited, the only intercity bus company which would eventually be owned by National City Lines. Southern Limited would acquire additional companies, forming bus routes south to Metropolis Illinois and Evansville Indiana.
1933 - South Suburban Motor Coach reorganized as South Suburban Safeway Lines.
1935 - South Suburban Safeway Lines service between Crete and Kankakee sold to Southern Limited. Crete would remain the most southern point served by South Suburban Safeway Lines until the end of private ownership.
1954 - Southern Limited sold to Greyhound.