First I have to tell you about a real stupidity of the ticket.:
 
In the country you are coming from, your INTERRAIL ticket is not valid. You have to pay 50% for every train you use. This is very stupid when you live for example in Germany or France because this are real transit countries and you have to go trough and pay !!!
The railways allways explain that the ticket is not for to see the own country, but it is to visit Europe. Okay...this idea I will understand. But when I live for example in France and I want to spent two weeks in Scandinavia and then two weeks in Spain, I have to travel trough France and I have to pay for. I don't understand...I won't visit France, I only want to visit Scandinavia and Spain. France is only transit. Why I have to pay for this transit?
Realy stupid this kind of argumentation of the european railways !!!