A train from South Korea - with several experts aboard - crossed the Korean peninsula's Demilitarized Zone to make its way into North Korean, the first time in over a decade.
"Through the one connected railway, the South and the North will prosper together and the ground for peace on the Korean Peninsula will be consolidated. The trains running on the track will also carry peace and prosperity with them to North East Asia and the world," South Korea's Yonhap news agency said.
The 28-member team will be examining suitable methods to help modernize the existing North Korean rail network, which leader Kim Jong-un reportedly remarked was in an "embarrassing" state. The group will reside on the train for the next 18 days while conducting the assessment.
The train was draped with a banner, as it headed over the heavily armed border, which described it as an Iron Horse, running towards an era of peace and prosperity. Later this year, South Korea will hold a ribbon-cutting ceremony celebrating the two rail links with the North, according to Yonhap news.
Both Koreas have taken major steps towards repairing the relationship between the two nations. South Korea's Moon Jae-in has been pushing to establish closer economic links with the Kim despite the United States insisting on immediate denuclearization talks.