Beijing Aerospace Shenzhou Intelligent Equipment Technology. 

Beijing Ctrowell Technology Corporation Limited engages in the production and sale of railway vehicle safety inspection and maintenance systems in China. The company offers railway vehicle infrared axle temperature detection systems, vehicle operation fault dynamic image detection systems, vehicle rolling bearing early fault trackside acoustic diagnosis systems, vehicle operation quality trackside detection systems, and related safety detection information products, as well as automation equipment. It also provides intelligent test simulation systems; and microsystem and control components, which include modular and integrated microsystems, and high-density integrated light and miniaturized control components. The company was founded in 1988 and is based in Beijing, China.