Sadang Station is a station on the Seoul Subway Line 2 and Seoul Subway Line 4. Sadang Station has one island platform for Line 4 and one side platform for Line 2. The Line 2 platform of this station is the first in Korea to have platform screen doors installed, on October 21, 2005. This station is the southern terminus for Line 4 trains that belong to the Seoul Metro. Both Line 2 and 4 stations are located in Sadang-dong, Dongjak-gu, Seoul. In a survey conducted in 2011 by the Ministry of Land, Transport and Maritime Affairs on 92 Administrative divisions across the country, it reported that Sadang Station is the third busiest public transit stop following Gangnam Station and Jamsil Station. It is followed by Seolleung Station and Sillim Station. In December 2010 the station is recorded as having the second highest WiFi data consumption of all the Seoul Metropolitan Subway stations, following Express Bus Terminal Station and followed by Dongdaemun Station, Jamsil Station and Jongno 3-ga Station.