There is no dry ice. According to the query of Yixiu Experience Network, dry ice is solid carbon dioxide. At normal temperature and pressure, carbon dioxide is gaseous, and there is a small amount of carbon dioxide in the air, but it can be compressed into a solid at high temperature and high pressure. In addition, the high-speed rail car is sealed. If dry ice is gasified at normal temperature, it will increase the concentration of carbon dioxide in the air, which is harmful to human body. So dry ice can't bring high-speed rail.