Yu Lin. China Railway 19th Bureau Group Co., Ltd. is a national special-grade enterprise in railway engineering construction, and it is a large-scale comprehensive construction enterprise integrating railway, highway, municipal administration, bridge, tunnel, deep foundation, industrial and civil construction, water conservancy and hydropower, airport and other projects. According to official website's query, by 2020, Yu Lin will be the deputy general manager of China Railway 19th Bureau Group Corporation and the commander of Southwest Command. The group company once ranked 2 1 among the top 500 construction enterprises in China, and ranked first among the top 500 construction enterprises 100 in Liaoning.