What are the operating hours for the Chicago L trains?

The operating hours for the Chicago L trains vary depending on the specific line and day of the week. Generally, most lines operate from approximately 4:00 a.m. to around 1:00 a.m. during weekdays and weekends. However, some trains may have slightly different schedules, especially during late-night hours. Certain lines might experience extended service during special events or holidays, while others could have reduced hours. The Chicago Transit Authority makes frequent updates to their schedule, so it is advisable for passengers to check the current web page for the most accurate and up-to-date information on operating hours, including any service changes or special schedules.