On 9 October 2006 an underground nuclear test was conducted at P'unggye-ri in Kilju County, causing the closure of the line for 3-4 months.[3]
Services
There is a large sawmill here that processes logs shipped by rail from the Paengmu narrow-gauge line via Paegam, and processed lumber is shipped from here to other destinations. Passenger trains run along the Samjiyŏn line to meet with trains running between Hyesan and Kilju.[4]