Online timetables
Some European railways offer a comprehensive online train time table. Examples of user-friendly and extensive timetables in English, are http://fahrplan.oebb.at (Austrian Railway Company ÖBB) and http://reiseauskunft.bahn.de (German Railways, Die Bahn). The OBB also offers the option to create a specific timetable as a PDF.
In these timetables, you can find the various options for traveling between main European cities. In the details of your trip, you can see whether a train needs a reservation, and you can compare trains and travel times. In the DB timetable you can also look for regional trains only. By doing this, you will be looking for trains which take longer, but generally require no reservation or supplement.

