Is China Railway 20th Bureau a state-owned enterprise or a central enterprise?

China Railway 20th Bureau is a central enterprise. China Railway 20th Bureau Group Company is a national large-scale construction enterprise, a wholly-owned subsidiary of China Railway Construction Co., Ltd., a fortune 500 enterprise and a central enterprise. China Railway 20th Bureau was founded in 1949, formerly known as the 5th East China Garrison Brigade of China People's Liberation Army, 10th Infantry Division 10 1, Railway Corps. During the War of Liberation, he participated in the liberation of Qingdao and Changshan Islands. During the War to Resist US Aggression and Aid Korea, he built an unbreakable and uninterrupted steel transportation line. After returning to China, we independently built Qinghai Haiyan Atomic Bomb Base and Jiuquan Satellite Launch Center Railway Line, which is known as the pioneer of "two bombs and one satellite". The new China Qinghai-Tibet Railway has been built on five Qinghai-Tibet Railways and three volcanoes since 1959. It is the only unit in China that has participated in the construction of Qinghai-Tibet Railway, and has created 13 projects in the plateau railway field, which is the highest in China and the world.