Kim's Train In China Ahead Of Vietnam Talks

North Korean leader Kim Jong Un's armoured train arrived in China late on Saturday ahead of his summit with US President Donald Trump in Vietnam, according to media reports.

The train arrived in the border city of Dandong after 9 pm, according to South Korea's Yonhap news agency and the specialist outlet NK News, though it was not known whether Kim was on the train.

The train's crossing into China follows days of speculation over Kim's travel plans, which remain shrouded in secrecy, as his team gathered in Hanoi ahead of the talks expected next Wednesday and Thursday.

Security was tight before the train's arrival, with police cordoning off the riverfront some 100 metres from the bridge with tape and metal barriers.

Guests at a hotel facing the rail bridge from North Korea were suddenly asked to leave on Friday and told it was closed on Saturday for impromptu renovations.

"The train is long and crossed the bridge slower than the tourist train, but its definitely him, there's a lot of police presence," an unidentified source told NK News.

Windows on the train were blacked out, the source said, with only headlights turned on as it crossed. (AFP)