The warning just says that it's a highly frequented travel day and therefore they recommend that your reserve seats.
Without reservation, you maybe won't have a seat and have to stand. No harm. I never reserve seats. Somtimes the trains are full, so one stacks ones bags somewhere in the aisle and sits there.
BTW: trains to and from Zurich are always very stuffed in the mornings n evenings. Half the coutry commutes to work there.
Don't know how German railways handle it, if your ticket is only valid for a specific train, but in Switzerland the ticket is valid for whichever train you fetch. If you miss the one where seats were reserved, you hop on the next one: there just will be no reserved seat in that one anymore.
I really thought quicksand was going to be a much bigger issue in my life when I was little
Last edited by neni; 01-29-2016 at 06:11 PM.