I wonder if grandfather post means the Einheitswagen IV (https://youtu.be/u3unRLu2BXM?t=90) or if they were already impressed with the IC2000 (https://youtu.be/T1IdUgrIjR8?t=63).

Although the LED lighting in the newer IC2000 is too cold for my liking.

I think it was the Einheitswagen that I liked. The IC2000 seems pretty spacious compared to the DB's RB trains, though maybe I'm not comparing apples to apples

There's also this interior of the Einheitswagen IV, which feels cosier than the one in the 1st video I posted: https://de.wikipedia.org/wiki/Einheitswagen_%28Schweiz,_Norm...