인천 도시철도
The extension to Incheon Subway Line 1 was designed to relieve the traffic congestion in western Seoul and northern Incheon. Nine stations were added on October 27, 2012, for the 10.2 km extension, starting from Onsu Station of Line 7 and ending at Bupyeong-gu Office Station of Incheon Subway Line 1. A western extension will add eight stations towards Incheon and will provide an interchange with Incheon Subway Line 1 and the AREX, while a northern extension will add six stations and will provide an interchange with the U Line.