How many bureaus does China Railway Corporation have? Which is the best? What's the worst thing?

China Railway Corporation has 25 bureaus. China Overseas Engineering Corporation, China Railway No.1 Bureau Group Co., Ltd., China Railway No.2 Bureau Group Co., Ltd., China Railway No.3 Bureau Group Co., Ltd., China Railway No.5 Bureau Group Co., Ltd., China Railway No.6 Bureau Group Co., Ltd., China Railway No.7 Bureau Group Co., Ltd., China Railway No.8 Bureau Group Co., Ltd., China Railway No.9 Bureau Group Co., Ltd.

China Railway Engineering Group Co., Ltd.:

(CREC for short, stock code: 60 1390) was established in March 1950, formerly known as the General Bureau of Engineering Design of the Ministry of Railways of People's Republic of China (PRC).

1958 was merged into the General Administration of Capital Construction of the Ministry of Railways, and was established as China Railway Engineering Corporation on 1 July, 1989. Since May, 2003, it has been managed by the State Council State-owned Assets Supervision and Administration Commission, and it is a super-large central backbone enterprise.