So I’m at FRA now waiting for my flight to London, and 3 out of the 4 trains I took during this trip were on-time within 3-4 minutes (or precisely on time). The last train, which took me from Dresden to the Frankfurt Airport, was more or less on time until we reached Frankfurt am Main Hauptbahnhof. There, a passenger needed medical attention and we had to wait ~15min until paramedics arrived. Afterward the train resumed its journey and we arrived at Frankfurt Airport with a 15min delay.

All in all, pretty impressed with the German train system. It’s not clockwork like in Japan, but everything was efficient, cabins were quiet, and the seats were comfortable.