I have a Eurail pass and my friend will buy an interrail pass soon (they are hoping for a spring sale). In the meantime, I wanted to make seat reservations for both of us on a train from Rome to Zurich (1st leg is Rome to Milan and then Milan to Zurich.) However, when I try to book seat reservations for both of us together on Rail Europe, it is asking for a Eurail pass number. I have one, but my friend is using Interrail and hasn’t purchased their pass yet. Is there a way for me to book both passes at once, even though my friend doesn’t have an Interrail pass number yet? Also the spot to type in Eurail pass number says “Eurail Global Pass 1st Class” for both of us, instead of Interrail for my friend. How would I get the other one to say Interrail instead? Thanks!
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Book Seat Reservation on Rail Europe without Interrail pass number for Rome to Zurich

Best answer by Sebastian Vetter
You can just add your number for both of you. Or generate a pass cover number from this site https://www.interrail.eu/en/book-reservations#/generatePassCoverNumber (enter any combination of 6 letters and digits, like A2BC34)
Raileurope will not check whether this number is valid, nor will it be printed onto your ticket. So as long as you can show both your reservation (bought through raileurope) and a valid pass to the train staff on your travel day, you will be fine.
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