Just from my experience, good luck hopping in Europe. Unless, y'know, you mean 'their' type of trainhopping (AKA not paying for a ticket).
Hitching is riddiculously easy compared to most places in the states, especially outta Amsterdam. I won't be there for a few months year, but you should have no trouble. It takes about 8 hours to get from A'dam to Berlin by Thumb.
Also, search around for info on Berlin and other international destinations.