http://www.interrailnet.com/ or http://www.inter-rail.org/ are two of the webs you can look into if you are interested in travelling around Europe by train. It is one of the most popular options among backpackers, though it may also be chosen by families or ordinary tourists. There are different passes, depending on where and how long you want to travel. Why don’t you go and have a look? It might be the beginning of your next summer plans!