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●Chapter 0:00 Opening 0:23 Gimpo Airport Station 2:27 Line 9, History of Seoul Subway 8:43 Features of Line 9 10:51 Gimpo Gold Line 17:43 Reasons for congestion on Line 9 19:45 Reasons for congestion on the Gimpo Gold Line 22:31 Measures to deal with congestion on the Gimpo Gold Line ●About this channel This channel provides detailed explanations of railway lines, stations, vehicles, etc. All videos are subtitled with YouTube, so you can watch them with subtitles on. I travel all over Japan, focusing on the metropolitan area. ●X (old Twitter) is here https://x.com/TakagiRailway