You can't. The temperature of the insulated car can only be maintained at MINUS 3-4 degrees, and the longer the transportation distance, the greater the temperature difference. It is only suitable for short-distance transportation with less goods in the city, and the insulated car is unlikely to go to the north in winter. The insulated car is a kind of "special car". It is specially used to transport perishable goods such as meat, fish, fresh fruits and vegetables. During transportation, this kind of goods need to maintain certain temperature, humidity and ventilation conditions. In order to prevent the temperature inside the car from changing greatly due to the influence of external temperature, the car body is required to have good heat insulation performance.