KTX to Busan in 2.5 hours, a 180 km/h express re-timing the capital region, and the 251-km GTX program compressing 25 million people into 30-minute orbits.
Seoul Station is where Korea’s high-speed spine meets the most ambitious commuter-rail program in Asia — the GTX, built to compress a 25-million-person metro area into 30-minute orbits.
Seoul Station anchors the KTX network: Busan in about 2.5 hours, the whole national high-speed grid radiating from one downtown terminus, plus the AREX express to Incheon Airport in 43 minutes.
The GTX-A line — opening in stages from March 2024 — runs at up to 180 km/h, more than double metro speed, and passed five million riders within its first year on the initial Unjeong–Seoul section.
The program’s scale: three first-phase lines totaling 251.2 km, each forecast to exceed 200,000 daily riders within two years — a deliberate re-timing of the capital region’s housing and labor map.
GTX trains carry 1,062 passengers per eight-car set at commercial speeds around 100 km/h end-to-end — suburban commutes of 30 minutes that used to take ninety.
Beneath it all, the Seoul Metro remains one of the world’s most ridden systems; the GTX’s purpose is not to replace it but to give the outer metropolis a fast lane into the core.
Every megacity eventually discovers that its real airport is its central station, and Seoul’s discovery is the GTX. The program treats a 25-million-person region as a single labor market — an ambition Tokyo reached by accretion over a century and Seoul is attempting in a decade. Watch the ridership forecasts: in Korea they tend to be conservative, because Korean commuters vote with their transport cards faster than modelers expect.
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