South Korean President Yoon Suk Yeol delivers remarks during an opening ceremony of GTX-A in Seoul, South Korea on March 29, 2024.
Officials are now pinning their hopes on the Great Train eXpress , a 134 trillion won underground speedtrain project that, by 2035, will provide six lines linking Seoul to several outlying areas. The line is due to go into service on Saturday, and once fully operational, the GTX will be one of the fastest underground systems in the world, with trains travelling at speeds of up to 180 km per hour, officials said.