What is the relationship between Railway Construction Heavy Industry and Railway Construction Equipment?

Railway Construction Heavy Industry and Railway Construction Equipment are brothers. According to the relevant information, Railway Construction Heavy Industry and Railway Construction Equipment are both subsidiaries of China Railway Construction, so they are brothers. The main business of Railway Construction Heavy Industry is the design, research and development, manufacturing and sales of roadheader equipment, rail transit equipment and special professional equipment; Railway construction equipment is mainly engaged in large-scale road maintenance machinery related business.