Taedong River
In 2003, however, the section of Line 1 between P'yŏngyang-yŏk and Songyo was closed, as the bridge over Taedong River started to deteriorate, splitting Line 1 into two parts divided by the Taedong River. The section from Songyo to Songsin was eventually replaced by a trolleybus in 2014. The part crossing the bridge was replaced by a bus service.