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Seoul Subway Line 4, which opened on April 20, 1985, is already celebrating its 39th anniversary! Next year will be its 40th anniversary. It's really amazing! We filmed the horns safely. Line 4 first opened between Sanggye and Sadang, and with the continuous extension of the up and down lines, it became a long subway that runs from Jinjeop Station in Namyangju, Gyeonggi-do to Oido Station in Siheung-si, Gyeonggi-do. I sincerely congratulate you on the 39th anniversary of the opening of Line 4! ???? Filming number KORAIL 341000 series Seogyo-gong 4000 series SeoulMetro Line4 39th anniversary celebrations. SeoulMetro Line4 Very good Job ???? ???? ???? Horn train: All trains Line 4 Nappagi Line 4 Dongjak Line 4 Jwungi Line 4 Shinjwungi (including test run) Line 4 S-car 1st and 2nd batches Line 4 Baptongi Line 4 4th batches Dawonsys SeoulMetro or KORAIL ????❤️????????????????????????