The Korail Class 321000 trains, created from an assortment of Class 5000, Class 6000, and new cars, are commuter electric multiple units in South Korea used on the Gyeongui-Jungang Line. Class 321000 trains were manufactured and delivered between 2006–2009 to provide service on what was known as the Jungang Line at the time, and to address progressing extensions starting from the extension to Paldang Station.