What? A train from North Korea and another from South Korea crossed the heavily armed border between the two countries last week, restoring a link that was severed in the 1950-53 war. When? May 17. Where? The trains crossed the demilitarised zone between North and South Korea. The South Korean train set off from Munsang Station, 11km south of the border. Who? Each of the two trains carried 100 South Koreans and 50 North Koreans - including celebrities, politicians and a South Korean conductor who worked on one of the last trains to cross in 1951. Why? South Korea has been pressing for more interaction between the two countries, while North Korea's military remains fearful of increased links to the outside world. How? North Korea finally agreed last week to the run after the South offered US$80 million in aid for its light industries. Eventually, South Korea wants to send passengers and cargo via its neighbour into China and Russia and link with the Trans-Siberian railway.