Of course, the #Interrail app knows nothing about trains being delayed, so in it I had to enter that I used the trains in my planned itinerary. Which in this case was not a problem; Berlin was my final destination, and DB staff just checks that the ticket is valid on the day in question anyway.
But what if I had planned to change in Berlin to some overnight train that left after midnight, accepting that I will then use one more travel day.
(continues)