Changchun Railway Vehicles
The carriage designations of bilevel cars in China start with "S", abbreviating "double-decker" () in Chinese. Current models of double decker trains include the 25B series , 25Z series and 25K series . Most bilevel cars in China were built by Nanjing Puzhen Rolling Stock Works, while some bilevel coaches were built by Changchun Railway Vehicles. The types of bilevel cars including bilevel hard seat (SYZ), bilevel soft seat (SRZ), bilevel hard sleeper (SYW), bilevel soft sleeper (SRW), Bilevel dining car (SCA) and bilevel soft seat-baggage combine car (SRZXL).