TOPSHOT - A South Korean train trainsporting dozens of South Korean officials travels on the rails which leads to North Korea, inside the demilitarized zone separating the two Koreas in Paju on November 30, 2018. - A train carrying South Korean engineers and officials crossed the border into North Korea for a joint survey with North Koreans for reconnecting the two Koreas with railways. (Photo by KIM HONG-JI / POOL / AFP)