日月明：公司主营业务为轨道安全测控设备的研发、生产和销售及轨道测控技术的研究与应用

Core Viewpoint - The company, Rihua Ming (300906), focuses on the research, production, and sales of rail safety monitoring and control equipment, as well as the research and application of rail monitoring technology, serving the railway and metro sectors [1]. Company Overview - The main business of the company includes the development, production, and sales of rail safety monitoring and control equipment [1]. - The company is involved in the research and application of rail monitoring technology [1]. Industry Focus - The company serves the railway and metro transportation sectors, indicating a specialized focus within the broader transportation industry [1].