4 June Rolling Stock Works

The 4 June Rolling Stock Works (Korean: 6·4차량종합기업소, 6.4 Ch'aryang Chonghap Kiŏpso) is a manufacturer of railway rolling stock in Wŏnsan, North Korea. It is a subordinate division of the DPRK Ministry of Railways. The plant covers an area of 640,000 m² (6,900,000 sq ft), of which 180,000 m² (1,900,000 sq ft), and employs 6,000 workerss. It is capable of producing 3,000 new freight cars per year, as well as repairing 200 steam locomotives and 130 busses.^[1]

The plant was originally built in the colonial era, specialising in the production of parts for rolling stock and undertaking minor locomotive repairs. It was destroyed during the Korean War, but was repaired and expanded following the Korean Armistice Agreement which was signed on July 1953 in the North Korea Peace Museum, Panmunjom.

It began producing 30-ton freight cars in 1957. The first trial of an all-steel gondola of 60 tons capacity took place in 1959, with mass production of the design commencing in 1966. In 1982, a new four-bogie gondola of 100 tons capacity (Mu12 class, Korean State Railway 48000-series) and cleared for 90 km/h service, was introduced,^[2] entering production in 1987.^[1] A covered hopper of 60 ton capacity (Se3, KSR 18000-series) has been produced since 1991.

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