The South Shore connects into the Metra Electric line just south of 115th street/Kensington. The Hegewisch stop is 35 minutes to downtown and is in Chicago by about a mile, but right on the state line. Hammond stop is 40 minutes and East Chicago is 45. I commuted from an hour and a half away along the same line and while stuff happens, 99% of the time it is on time. Towns like Highland, St John, and Schereville aren't too far away from those stops.