Fittingly, a troupe that
debuted as Chicago Transit Authority (the eponymous agency brought legal action to get that name changed) asked that question. For years, the
South Shore Line, properly the Chicago South Shore and South Bend, issued all-year-around printed timetables, advising that all published times shown were those in effect in Chicago. When both Indiana and Illinois were on Standard Time, the South Bend passenger had to mentally add an hour; for that part of the year when Illinois and the Indiana Region observed Central Daylight Time, the South Bend passenger might not have had to make any changes, as Indiana was far enough west in the Eastern Time Zone for those counties on Eastern Standard Time to stay on Eastern Standard Time. Those changes might not have inconvenienced too many passengers on the east end of the railroad, as, well into the 1960s, the railroad
offered a memory pattern schedule with hourly South Bend Limiteds, with Gary Expresses on the half hour. Conditional and positive stops for the morning Limiteds sufficed to serve any passengers from LaLumiere or Hudson Lake or New Carlisle for Bendix or downtown South Bend. These days, the conditional stops are gone, although with all trains pulling out of Michigan City to form South Bend departures, there are morning departures for any local passengers so inclined.
Conditions were more complicated on the North Shore Line, the
much-lamented and more than a little bit missed Chicago North Shore and Milwaukee. Yes, the railroad operated entirely in the Central Time Zone. After the War, though, Illinois observed Daylight Saving Time whilst Wisconsin did not. So much for agricultural interests favoring Daylight Saving Time. The cock crows at sunup, irrespective of what's on the clock, and farm kids know about morning chores before they head off to school. Thus, when Wisconsin did adopt Daylight Saving Time, that ended on the final Sunday in September, whilst Illinois stayed with it until the final Sunday in October.