A North Korean train crosses the border line as a South Korean soldier watches at the demilitarized zone (DMZ) in Goseong, east of Seoul May 17, 2007. Two trains from North and South Korea crossed the heavily armed border on Thursday, restoring for the first time an artery severed in the 1950-1953 fratricidal war and fanning dreams of unification. It took the two Koreas 56 years to send the trains -- one starting in the South and one in the North -- across the Cold War's last frontier for the runs of about 25 km (15 miles). REUTERS/Ahn Young-joon/Pool (SOUTH KOREA)