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The daytime trains are free of charge with InterRail. For trains travelling overnight between the two cities supplements might be payable - you can find the info in the relevant country boards of the forum.
Yeah I have been hopping on and off trains for 3 weeks now and I haven't payed for any supplement or reservation only a reservation of a bed in a night train and yes the train schedule website says that I'll need a reservation or supplement but actually don't.