SEOUL-OCT 17: People on subway platform on Oct17,2009 in Seoul, Republic of Korea. The Seoul Metropolitan Subway consists of 18 lines and is the world's most extensive subway system by length,957.3 km
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SEOUL-OCT 17: People on subway platform on Oct17,2009 in Seoul, Republic of Korea. The Seoul Metropolitan Subway consists of 18 lines and is the world's most extensive subway system by length,957.3 km