I never cease to be amazed and in awe of quite how thorough and comprehensive @seatsixtyone’s website is.
Today, I have discovered he has the One True Guide to how and where to get Interrail seat reservations, broken down by country, destination, and, where appropriate, train company: www.seat61.com/interrail-and-eurail-reservations.htm
It even has the ČD money saving tip for Germany, and the Passzuschlag hack I had to use for the Eurocity between Milan and Frankfurt.
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