The Auslandskursbuch der Deutschen Bahn is realy good and very very useful to find train connections in Europe...
it is in german language but easy to read even for persons who do not speak german ... because you will find there only timetables in it ...
The official name is Kursbuch Europa
and you can buy it in every big german railway station for EUR 7,50.
The Auslandskursbuch is published in the month of June for the summer. It has the same content like the Thomas Cook European Rail Timetables, which is published every month.
You can find the Thomas Cook European Rail Timetables