How does the air conditioning work in a train?

The temperature inside a train is an important factor in the passenger experience. For the overall design of the train, the manufacturer has to take a variety of data into account, such as the degree of sunshine and temperatures on the line, the presence of tunnels, expected passenger numbers…

Catching a cold or having trouble calming your baby down because of the heat… A train journey can be spoiled by factors that have nothing to do with traffic or punctuality. The heating and air-conditioning system, whose central unit is usually placed on the roof, ensures the thermal comfort and the quality of the air on board. Temperature variations can be caused by several factors. Therefore, the train has to be adapted to the line it runs on: for example, in warm and very sunny regions, it makes sense to avoid large untinted windows and a car body painted in black. Temperature and air quality sensors also play a decisive
role, because as well as managing the temperature, the system recycles the air and therefore regulates the amount of oxygen available in the train cars.

More information - Train operation