. According to official website's inquiry, China Railway Heavy Industry and China Railway Technology are both subsidiaries of China Railway Corporation. China Railway Heavy Industry Co., Ltd. was established on February 20 19, 19. Is a high-tech enterprise of construction machinery integrating design, manufacture, installation and maintenance, mainly engaged in track-laying and bridge-building equipment and special machinery for railway construction. China Railway Science and Industry Group Co., Ltd. was established in 2002, formerly known as Zhuzhou Bridge Factory of the Ministry of Railways.