The mysterious armoured train that arrived in Beijing on Monday night is one of the main pieces of evidence to support the theory that Kim Jong-un is making a historic visit to China. While Beijing has yet to confirm Kim is in Beijing, the arrival of the train coupled with reports of heightened security at a state guest house and along the Chinese border with North Korea, all point towards a visit by a senior figure from Pyongyang. If the train really was carrying the younger Kim it would be his first trip abroad since he succeeded his father in...