Recently, the first test line of rare earth permanent magnetic levitation rail transit project in China, the "red track", was officially completed in Xingguo County, Jiangxi Province, and realized the combination of rare earth permanent magnetic levitation technology and air rail technology to build a new rail transit system with medium low speed and medium low volume. What are the components, characteristics and technologies of the whole test line? Yang Jie, Dean and Professor of Jiangxi University of Science and Technology's Permanent Magnet Maglev Technology and Rail Transit Research Institute, explains for you.