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South Korea did partner with Hyperloop Transportation Technologies (HTT) on a proposed hyperloop-style system in 2017, but the agreement was for technology licensing and development—not a completed railway. No passenger service resulted from the announcement. South Korea’s current hypertube work is a separate, government-backed research program led by the Ministry of Land, Infrastructure and Transport (MOLIT) and the Korea Railroad Research Institute (KRRI).
What South Korea and HTT agreed to in 2017
HTT publicly announced a licensing deal on June 20, 2017, describing joint development of a full-scale system called HyperTube Express, or HTX. Contemporary reporting said the underlying Korean agreement dated to January 2017 and identified the Korea Institute of Civil Engineering and Building Technology (KICT), Hanyang University and a South Korean government technology or infrastructure department among the Korean participants. The report does not establish that the national government approved or funded a route. Axios’s report on the announcement describes a development and licensing arrangement, not a construction contract or launch date.
HTT was the private company supplying the hyperloop concept and licensing relationship. KICT and Hanyang University were Korean research participants. KRRI is a different institution: it is the railway research institute associated with Korea’s later hypertube research. These organizations should not be treated as a single project team whose every subsequent result came from the 2017 deal.
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HTX was a proposed hyperloop-style transport system, not an ordinary extension of KTX. Its concept combines a sealed, very-low-pressure tube with magnetic levitation or electromagnetic suspension and electromagnetic propulsion. Lower air pressure is intended to reduce aerodynamic drag, while the propulsion system accelerates a passenger or cargo capsule. KRRI describes its HTX research scope as including system requirements, integrated design, safety and operations, propulsion and control, and infrastructure technologies. KRRI’s HTX Research Department presents these as research areas, not proof of an operating route.
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Public descriptions have put the intended speed in the range of roughly 1,000 to 1,200 km/h. Those are targets, not a certified passenger operating speed. The often-repeated Seoul–Busan trip of about 20 minutes is likewise a projection for a future system, not a timetable or journey available to travelers.
What KRRI has demonstrated—and what the figures mean
KRRI reports that a scaled model reached 1,019 km/h in a low-pressure tube at 1/1,000 of atmospheric pressure. This is a miniature-system test, not a full-size passenger train traveling at that speed. KRRI also reports work on superconducting propulsion and levitation, including a test operating at 40 K without an onboard cryocooler, a stated 64% vehicle-weight reduction compared with a cryocooler-mounted approach, and a stabilization system intended to improve ride quality in simulated 1,000 km/h conditions. These are institute-reported research results; they do not demonstrate a complete, certified transport system. KRRI’s hypertube technology results give the test context.
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How this differs from a KTX journey
KTX is conventional high-speed rail: trains run on rails using established electrification, signaling and passenger-service systems. A hypertube would require a dedicated guideway, a sealed tube and pressure-management equipment, a different propulsion architecture, and new safety and operating arrangements. It could not simply use existing KTX tracks and stations.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minute| System or claim | What it represents | Status |
|---|---|---|
| KTX | Conventional high-speed rail; Korea.net gives a Seoul–Busan journey of approximately 1 hour 52 minutes in its 2025 comparison. | Existing passenger service. |
| KRRI’s 1,019 km/h result | Scaled-model test in a low-pressure tube at 1/1,000 atmospheric pressure, as reported by KRRI. | Experimental result, not full-scale passenger operation. |
| HTX or national hypertube targets | Proposed system performance; the Seoul–Busan estimate of about 20 minutes is a projection. | Research and future-system objective, not a commercial timetable. |
The Seoul–Busan comparison and the 1,200 km/h target appear in Korea.net’s explanation of the Hypertube proposal. A projected journey time cannot be compared with today’s rail service as though both were operating options.
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South Korea’s current hypertube program
In April 2025, MOLIT announced a national research-and-development program running from 2025 through 2027, with KRRI as the lead research institution. The reported total budget is KRW 12.7 billion, including KRW 3.68 billion allocated for 2025. The program targets a 1,200 km/h system and focuses on magnetic levitation, electromagnetic propulsion and operation in an ultra-low-pressure tube; Korea.net describes the target tube pressure as approximately 0.001–0.01 standard atmosphere. These figures describe a research program, not construction spending for a passenger line. The government announcement identifies the current effort as a MOLIT–KRRI R&D initiative.
The 2017 HTT licensing and development agreement is documented, but current official Korean material presents the national program as MOLIT- and KRRI-led. The available sources do not establish that HTT remains the active prime contractor or operator, nor do they establish that the original agreement was formally terminated.
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Why a technology target is not yet a railway
Reaching a high speed in a short test tube addresses only part of the challenge. A full route would need to maintain very low pressure over long distances, detect and repair leaks, accommodate thermal expansion and structural movement, and keep the vehicle stable despite vibration and alignment tolerances. Operators would also need safe braking after a power failure, reliable communications and control, routing and station-entry systems, and a workable way to evacuate passengers from a sealed tube during an emergency.
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Those requirements bring substantial infrastructure and regulatory trade-offs. A dedicated guideway and new maintenance, safety and certification systems could potentially support much higher speeds and reduce aerodynamic drag, but they would not be interchangeable with conventional rail infrastructure. A licensing agreement, research program or scaled test does not by itself establish route funding, environmental approval, land acquisition, construction, passenger certification or commercial service. None of the cited evidence establishes a completed HTT passenger railway in South Korea.
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