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Busiest Stations by Line: Line 6 - Gongdeok Station Line 7 - Gasan Digital Complex Station Line 8 - Munjeong Station Average Congestion (Rush Hour): Line 6 - 130% Line 7 - 150% Line 8 - 160% Other Information: Passengers cannot enter the driver's cab under any circumstances. Drivers use a folding portable toilet inside the cab for bowel movements. For urination, if it is extremely urgent, they may make an announcement to passengers and run to a restroom. Access to the cab is only possible with a master key issued to drivers. Announcements are broadcast automatically. Acceleration and deceleration are controlled by pulling a lever. The maximum capacity per "car" is approximately 180 people (not the entire train). Drivers must keep their mobile phones in a dedicated case during operation. (The case blocks signals to prevent use while driving; even alarms will not sound.) To turn the train around, the driver must reach the turnaround track and run to the opposite cab within 8 minutes before entering the opposite platform. Seats do not have seatbelts or armrests. Windows cannot be opened except in the driver's cab. Trains must receive a signal before entering the depot. Line 6 is notoriously noisy. Specifically, the Changsin-Bomun, Itaewon-Hangangjin, Bulgwang-Dokbawi, and Anam-Korea University sections are famous for high noise levels. The Itaewon-Hangangjin section is noisy even though it is a straight track.