Sinseol-dong Station is a station on the Seoul Subway Line 1

Seoul Subway Line 1

Seoul Subway Line 1 of the Seoul Metropolitan Subway, formerly known as the Korea National Railroad of Seoul, is an operation channel which links central Seoul, South Korea to Soyosan Station in the northeast, Incheon in the southwest, and Asan via Suwon in the south. This line covers a large part...

 and the Seongsu Branch of Seoul Subway Line 2

Seoul Subway Line 2

Seoul Subway Line 2 is a circular line of the Seoul Metropolitan Subway. The line running clockwise is called the "inner circle line" and the counter-clockwise line is called the "outer circle line." This is Seoul's most heavily used line, and the longest circular subway line in the world...

. There is a piece of track that connects the Line 1 and Line 2 stations, and Line 1 trains belonging to Seoul Metro

Seoul Metro

Seoul Metro is a public corporation which runs the Seoul Subway Lines 1 to 4.From 1970 to 2006, it was called Seoul Metropolitan Subway Corporation.-Lines:- See also :* Korail* Seoul Metropolitan Rapid Transit Corporation...

 are serviced at the Gunja Train Depot behind Yongdap Station

Yongdap Station

Yongdap Station is a station on the Seongsu Branch of the Seoul Subway Line 2.This station is located in Yongdap-dong, Seongdong-gu, Seoul.-References:...

using this connective track.

There is a 'secret' unused platform on the B3 floor of this station; this used to be the original Line 2 platform. However, due to intermittent flooding, this platform was closed off, and a new platform on the B2 floor serves as the current Line 2 station.