An agreement on cross-border operations had been made between Kukch'ŏl and Korail already in April 2004, but three subsequent attempts to run trains failed, until finally the military authorities on both sides adopted a security agreement on 11 May 2007, allowing the reopening of the lines on 17 May. The reopening consisted of two ceremonial trains, one over the western line from Munsan to Kaesŏng ( 27 kilometers ), and another over the eastern line from Kŭmgangsan to Jejin.