Seoul Metro Launches English Warning Signs at Depots

SEOUL, SOUTH KOREA – Seoul Metro announced a system-wide installation of English-language warning signs around all depot facilities after documenting four cases of illegal entry and graffiti vandalism by foreign nationals over the past five years. The decision follows a January 2024 incident in which three Russian citizens allegedly scaled a four-metre wall at the Gunja depot at 3:10 a.m., painted a train, and boarded a flight to China later that same day. CEO Kim Tae-gyun had initially called for the measure in April 2025.

What Happened and What Is the Scale of Impact?

Seoul Metro depots experienced four confirmed incidents of trespassing and graffiti vandalism by foreign nationals between 2020 and 2025, with the two most recent cases occurring at the Gunja depot serving Lines 5 and 7 in 2024 and 2025. The January 17, 2024 breach at Gunja involved a sprayed area measuring approximately four metres wide by 1.5 metres high on a parked train. In a separate case in Busan, an Australian national in his twenties and a Belgian national in his thirties allegedly entered the Daejeo depot at 2:51 a.m. through a fence near a test track, vandalised a subway train, and departed by 3:09 a.m. The pair subsequently took a KTX high-speed train to Seoul, travelled to Incheon International Airport, and boarded a flight to Brunei by 11:00 a.m. the following day. Police reported that the suspects wore masks, changed clothing multiple times, paid in cash, and disembarked at different stations to evade detection.

Key Incident Data

How Does This Compare to Similar Incidents on This Network?

Seoul Metro’s four depot intrusions over five years represent a relatively low frequency compared to graffiti vandalism rates on major European and North American metro systems. London Underground recorded an average of over 500 incidents of railway-related criminal damage annually across its network between 2020 and 2023, according to British Transport Police statistical reports (Source: British Transport Police, 2023). The New York City Transit Authority spent approximately US$1 million per year on graffiti removal and prevention during the same period (Source: MTA Annual Budget Reports, 2023). What distinguishes the Seoul cases is the documented pattern of international perpetrators travelling to South Korea specifically to commit vandalism and departing within hours — a phenomenon that European operators, including Berlin’s BVG and Paris’s RATP, have also reported but at significantly higher volumes. The previous signage at Seoul Metro depots varied in size, was mounted at irregular intervals, had been installed at different times, and did not consistently reflect recent legislative changes to trespassing penalties. The new standardised design, modelled on warnings already deployed at Gyeonggi Province depots including Moran in Seongnam and Jichuk in Goyang, represents a shift toward the type of layered deterrence used by Hong Kong’s MTR Corporation, which employs uniform multilingual signage, CCTV coverage, and rapid-response security protocols at all depot perimeters (Source: MTR Corporation Security Brief, 2024).

Editor’s Analysis

These incidents expose a vulnerability specific to Asian metro systems that have invested heavily in modernisation without commensurate upgrades to depot perimeter security. China’s urban rail sector committed substantial funding across 2025 to new line construction and system upgrades across major cities — a parallel expansion that increases the number of depot access points requiring surveillance. The cross-border nature of the Seoul cases, where perpetrators exploited visa-free entry or short-term tourist visas to enter, commit vandalism, and leave before investigation processes could begin, mirrors a tactic documented in European graffiti subcultures since the early 2000s. Seoul Metro’s signage response addresses the legal communication gap — existing signs were not in English, the language most accessible to international travellers — but does not constitute a physical barrier upgrade. Without concurrent investment in fence height, motion detection, or thermal camera coverage, the operational risk of repeat intrusion remains unchanged.

FAQ

Q: What specific criminal penalties will the new English warning signs reference?
A: Seoul Metro has not published the exact statutory penalties that will appear on the new signs. The operator stated only that the text will explicitly mention criminal penalties for trespassing on railway premises and for vandalism, in accordance with recent South Korean legislative updates.

Q: How much have these four depot graffiti incidents cost Seoul Metro in total repairs?
A: Seoul Metro has not disclosed aggregate repair costs for the four depot incidents. The operator confirmed that each event incurs both direct train repair expenses and indirect costs from service preparation delays, but no total figure has been released.

Q: Will the new warning signs be installed at all Seoul Metro depots or only those that have been targeted?
A: The announcement states that signs will be installed “around its depots” using a standardised design, which indicates a system-wide deployment covering all depot facilities. A specific depot count or installation completion date has not been officially confirmed.