Hrrm. Funny. I thought that those were so called "Eurofima", which I remember as fucking cold in summer, because then their AC were set at full blast, which was annoying at the times.

https://en.wikipedia.org/wiki/Eurofima_coach

Also no real opening of windows anymore, because early onset of https://de.wikipedia.org/wiki/Druckertüchtigte_Schienenfahrz... <- meaning pressure protection against passing trains at high speeds, entering tunnels, and such.