北緯38度線突破へ！ 韓国ソウル首都圏電鉄1号線漣川延伸に伴うダイヤ改正(2023年12月16日) 북위 38도선 돌파에! 한국 서울 수도권 전철 1호선 동두천~연천 연신
Seoul Metropolitan Subway crosses over lat 38°N. With the extension of the Line 1 to Yeoncheon, timetable is going to be revised
https://www.train-times.net/article/seoul20231216
Even if it's extended to Yeoncheon, train will be operated at every one hour during daytime. And, all of the trains through Seoul are local trains.
I wonder why 10 car train is needed in such a remote area.
