@ad951bfd I sometimes book a seat on the next train when I see it is unlikely I'll make a connection. It only costs 6 euros in the DB app - from my seat on the late running train. It is worth it if the second leg is long. 

 @20e33bb6 I was trying to work out how to do that in the app too, without success... but in the end it's been ok, I've had a seat on all trains.