Gyeongwon Line restoration halted after North Korean nuclear test

The Gyeongwon Line once connected Seoul with Wonsan on North Korea's east coast. It was cut by the division of the peninsula and the Korean War, and its northern part has remained out of use since. South Korea had worked on and off to rebuild its own stretch near the border as part of a wider hope of reconnecting the two Koreas by rail.

In May 2016, the government in Seoul stopped construction on the southern section. The decision followed North Korea's fourth nuclear test, carried out in January 2016, and a period of sharply worsened relations. In the same months, Seoul also took other measures against Pyongyang, including closing the joint Kaesong industrial complex, a factory park just inside North Korea.

The halt mattered because the project had been seen as a symbol of inter-Korean cooperation and a possible link to the wider Eurasian rail network. Its suspension showed how closely such infrastructure plans were tied to the security situation. The work stayed frozen for years, which is why a later decision to restart it is treated as a significant shift in policy.