"Given increasingly severe heat waves, there is a high risk that the previously planned air conditioning systems rated for up to 45°C will not be enough. "
They better make sure it works: "Germany: June heat wave linked to 5,000 excess deaths".
To ensure it can still offer functioning air conditioning on trains in the coming decades, Eurostar is playing it safe. The company has chosen the "Sahara option" for its Celestia trainsets, even though it will be expensive. Eurostar is likely to benefit from the development of a train for North Africa.