So I'm planning to buy a 5 country pass(Italy, France, Germany, Benelux and Czech Republic) and that's all the countries I need it for but I do plan to take an overnight train from Munich, Germany to Venice, Italy. I know this will pass through Austria. I was reading on the 'plan your trip' section about this exact example:
* Crossing Austria on the Munich-Venice route costs about $40 additional in second class, making it worthwhile to add Austria to your pass.
I would add Austria to my pass but I already have 5 countries so I can't. So I don't mind paying the extra $40 to take this train but I was just wondering how I would go about doing this? When and where do I pay the extra fee to pass through an additional country?