The only problem with the proposed Inter-Korean Railway project is that the North Koreans have not agreed to it yet. However, I suspect that this will be part of an effort to restart tourism to the Kumgang Resort in North Korea that the Moon administration will eventually try to circumvent sanctions to do if they are not dropped by the time this railway extension is completed:

The South Korean government on Monday held a ceremony to reconnect its railroad system to the North’s, marking the second anniversary of the inter-Korean summit at Panmunjom in 2018.
South Korea’s railway on its eastern coast, called the Northern East Sea Line, will be extended by a total of 110.9 kilometers (69 miles) from its current northernmost point in Gangneung all the way to Jaejin Station in Goseong County, Gangwon, the last stop on South Korean territory below the military demarcation line with the North.
Unification Minister Kim Yeon-chul, who led the ceremony, in an opening address called the construction of the railway a “Korean Peninsula New Deal” project meant to “inaugurate a new age in which the continent meets the ocean.”
Joong Ang Ilbo
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