1. CRRC Qingdao Sifang Locomotive & Rolling Stock Co., Ltd.: Established at 1900, this company belongs to China Machinery Industry Group, and is mainly engaged in R&D, manufacturing and sales of railway locomotives and construction machinery, including manufacturing of high-speed rail wheels.
2. Taishan Tire Co., Ltd.: Founded in 1976, this company is a listed company mainly engaged in the production and sales of tires and related products, and its subsidiary Taishan Iron and Steel is also mainly engaged in the research and development and manufacturing of related products in the field of railway transportation, including the manufacturing of high-speed rail wheels.
3. Beichen Industrial Co., Ltd.: Founded in 1993, this company is a listed company mainly producing automobile and motorcycle parts, and its subsidiary Beichen Hub Co., Ltd. is also involved in the manufacturing of high-speed rail wheels.