I purchased 2 tickets, one for myself and one for my daughter, on trainline. I just printed them off and it appears that there is just one ticket for the 2 of us. My name is the only name on the ticket as the "lead passenger". I am the only one that requires ID. Is this set of tickets only valid if we go together? If for some reason I couldn't go, does that mean my daughter is out of luck? I can't get any info from the Trainline website.
We are traveling from Amsterdam to Cologne and back.