We were booked to go from Frankfurt to Copenhagen by train from Frankfurt to Hamburg Hbf then Hamburg Hbf to Copenhagen. There was just one problem - the train to Copenhagen went from Hamburg Altona not Hbf and there wasn't time to make the connection. Fortunately DB were able to get us on a later train with seats reserved but we are arriving a couple of hours later than planned.
It's definitely worth checking that the connections offered are correct and actually work!
