Korea Train Express

2016 film directed by Yeon Sang-ho

KTX (Korea Train eXpress, ) is the first high-speed rail system in South Korea, and is operated by Korail. Construction began on the high-speed line from Seoul to Busan in 1992. KTX services were launched on April 1, 2004.

The KTX-Sancheon (, formerly called the KTX-II) is a South Korean high-speed train built by Hyundai Rotem and operated by Korail and SR Corporation. With the maximum operational speed of , the KTX-Sancheon is the second commercial high-speed train operated in South Korea, as well as the country's first domestically developed high-speed train in commercial service.

The KTX-I, also known as the TGV-K or Korail Class 100000, is a South Korean high speed train class based on the French TGV Réseau. The 20-car formation of the trainsets without a restaurant car is optimized for high capacity. The 46 trainsets were built partly in France and partly in South Korea in the framework of a technology transfer agreement, which was the basis for further domestic high-speed train development in South Korea.

HSR-350x, alternatively called G7, KHST or NG-KTX, was a South Korean experimental high-speed train. It was developed and built in a joint project of government research institutes, universities and private companies that started in 1996, which aimed to reduce import dependence in high-speed rail technology. New components developed for the HSR-350x included motors, electronics, and the carbody of passenger cars. Test runs were conducted between 2002 and 2008. The experimental train achieved the South Korean rail speed record of in 2004. The HSR-350x was the basis for Korail's KTX-II (KTX-Sanc

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HEMU-430X (standing for High-Speed Electric Multiple Unit 430 km/h eXperimental) is a South Korean experimental high-speed train designed to achieve a maximum speed of . On 31 March 2013, it achieved a record of during a test run, making South Korea the world's fourth country after France, Japan and China to develop a high-speed train that operates above . The notable feature of this train compared to older South Korean high-speed trains is distributed traction. The commercial versions of these trains, known as KTX-Eum and KTX-Cheongryong, were delivered to Korail from 2020 onwards.