Patent authorization for a domestically developed light-rail component was recently granted in the United States, which is among the nations with the world's most stringent patent examination standards.

Developed by Qingdao Sifang Rolling Stock Research Institute Co, the product could effectively reduce noise, decrease attrition and is easy to maintain. It is now used in metros and light-rail transit systems in many cities, including Changchun, Dalian, Shenzhen, Xi'an, Beijing and Guangzhou.