Did you know that each successive generation of German high-speed trains has had air-conditioning plant built for higher temperatures? The trains from the early 90s handle a temperature range from -20 to +32 degrees Celsius. Those from the mid-90s, -20 to +32, but if necessary they can exceed that. The ICE Type 3 handles temperatures up to 35 degrees, and the ones still to be delivered up to 40. And the next class? They’re planning for 45 degrees. Apparently the International Railway Union standard is going to be revised upwards.