All tunnels connected about five years after construction began, with opening targeted for late 2027.
All sections of the Dobongsan–Okjeong Metropolitan Railway line currently under construction in Gyeonggi-do have now been fully connected, allowing the project to move into its final construction stages. With all tunnels linked, follow-up work including structural completion, system installation, and station finishing will proceed in sequence.
According to Gyeonggi-do, the full breakthrough of the entire 15.11-kilometer tunnel was achieved about five years after construction began in December 2020, marking the completion of one of the project’s most critical phases. The project will now move forward with electrical, signaling, and other system installations, as well as interior and exterior station finishing work.
Tunnel breakthroughs were completed in Section 1 in February last year and in Section 3 in April, followed by full connection of the remaining sections, officially completing tunnel excavation across the entire route. Safety inspections and quality control will continue alongside the remaining construction stages.
The Dobongsan–Okjeong Metropolitan Railway project is an extension of Seoul Subway Line 7, with a total project cost of approximately KRW 774.7 billion. The line is scheduled to open by the end of 2027 and is expected to significantly improve transportation conditions in northern Gyeonggi, reduce travel times, and enhance public transit accessibility.
Gyeonggi-do stated that safety management and quality control will remain top priorities during the remaining construction phases, and that on-site inspections will be carried out at each stage to ensure the project is completed without delays.
Source: Gyeonggi-do Provincial Government
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