I and my wife will be traveling on a EuRail pass in a couple of weeks. I am aware that many fast trains in Europe, including the ICE International, require a supplement and sometimes a reservation. We are travelling from the Netherlands to Dusseldorf in Germany and further travels within Germany.
I have found it impossible to book a reservation and pay the supplement through RailEurope or EuRail on the ICE 123 (Amsterdam-Utrecht and then into Germany); EuRail tells me my order number is wrong for their system. DBahn won't complete a reservation that crosses an international border. And NS-International won't sell me anything but a full ticket.
We will have to go to the counter in the Netherlands anyway, to activate the EuRail pass, and I know I can pay the surcharge then. What risk is there on the ICE to not getting a seat reservation?