The GTX-C line, set to lead a transportation revolution in the Seoul metropolitan area, has finally entered a phase of full-scale project normalization. After facing difficulties due to prolonged construction cost increase issues, GTX-C resolved its conflict on April 1, 2026, through an arbitration decision by the Korean Commercial Arbitration Board. A partial increase in the total project cost was confirmed, and the lead contractor, Hyundai E&C Consortium, began preliminary work such as relocating existing facilities and installing fences on April 30. The plan is to proceed with the main construction after securing funding within the year. The initially projected opening in 2028 has been delayed and is now expected after 2031. This article will illuminate future changes by analyzing the latest progress and key issues of GTX-C.
The GTX-C line will connect Deokjeong Station in Yangju, Gyeonggi Province, through key Seoul downtown areas like Cheongnyangni and Samsung Stations, to Suwon Station in Gyeonggi Province, spanning a total length of 86.46 km. Once operational, it is expected to connect the north and south of the metropolitan area within 20 minutes, drastically reducing commute times. GTX-C will construct a straightened track below 40 meters underground, a highly challenging process that will traverse under the Han River and through core urban areas. Hyundai E&C plans to apply advanced mechanical tunneling methods, including Shield TBM, Gripper TBM, and high-performance roadheaders, along with the Tunnel Smart Safety System (HITTS), to ensure the safety of the deep tunnels.
Despite resolving construction cost disputes, GTX-C still faces significant issues that need to be addressed. A prime example is the installation of a 154kV high-voltage substation underground at Cheongnyangni Station. Residents of nearby 65-story apartments are strongly opposing the project, citing concerns about electromagnetic wave exposure and the possibility of substation accidents. Residents argue that the environmental impact assessment and explanatory meetings were conducted merely as a formality. The Ministry of Land, Infrastructure and Transport is reviewing alternative sites and emphasizes that it will operate within safety standards, but continuous communication and the search for reasonable solutions are essential.
Discussions regarding the extension of the GTX-C line are also a major point of contention. The extension projects being pursued by six local governments, including Dongducheon, Hwaseong, Osan, Pyeongtaek, Cheonan, and Asan, have shown an economic feasibility (B/C ratio) of 0.88 in the feasibility study for local investment projects, falling below the standard. This raises the possibility of the projects being halted due to insufficient projected demand and high construction costs. Local governments and the Ministry of Land, Infrastructure and Transport are seeking cost-saving measures. On the other hand, the proposed stop at Yangju Station has secured high economic feasibility with a B/C ratio of 2.90-3.98 based on preliminary feasibility study results, which is interpreted as a positive signal.
Upon its opening, GTX-C will bring innovative changes to the lives of metropolitan residents. Travel times between major hubs in the metropolitan area will be significantly reduced, enabling travel from Deokjeong and Suwon to Samsung Station in approximately 20 minutes. This is expected to greatly contribute to alleviating traffic congestion, expanding housing choices, and promoting balanced regional development. It will also enhance transfer convenience with the GTX-A line through its connection with the Samsung Station Complex Transfer Center. The Ministry of Land, Infrastructure and Transport emphasizes safety management for all GTX projects as its top priority.
GTX-C, which has finally broken ground after a long wait, stands at a crucial turning point, poised to open a new horizon for the metropolitan area's public transportation network. Starting with resolving construction cost disputes, it requires addressing issues through communication with residents and, above all, meticulous construction prioritizing safety. Until its opening after 2031, the government and construction companies must closely cooperate to do their utmost to make the '30-minute commute era,' a fervent wish of metropolitan citizens, a reality. We anticipate GTX-C will be successfully completed and significantly contribute to the transportation convenience and regional development of the metropolitan area.
Q1: When will the GTX-C line open?
A1: Although the initial target was 2028, it has been delayed and is now expected to open after 2031. Actual construction will take approximately 5 years from the commencement of work.
Q2: What are the main issues concerning GTX-C?
A2: Remaining issues include resident opposition to the installation of the substation under Cheongnyangni Station and securing economic feasibility for some extension sections.
Q3: How much will commute times be reduced upon the opening of GTX-C?
A3: Travel time from Deokjeong Station and Suwon Station to Samsung Station will be possible in about 20 minutes, significantly reducing commute times on major metropolitan routes.
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