The UIC type-I railcars form a set of railcars suitable for transporting perishable goods that require protection from heat. This UIC type includes three different types of railcars:
- isothermal railcars, which protect goods from the outside temperature by reducing heat exchange;
- cooler cars (or wagon-glacière), which generate cold by means of blocks of ice and a ventilation device controlled either by wind turbines located on the roof of the car or electrically by means of a generator driven by a axle on the car.
- refrigerator cars, which have active refrigeration systems and operate much like a refrigerator.