How do I know which pass (and # of days) is right for me?
Well, that all depends on how long you plan to travel for, not to mention the number of countries and cities you intend to visit. Our recommendation would be if you plan on traveling for more than 3 days, consider getting a pass. For less than 3 days, purchasing individual tickets is the better way to go.
You should also consider a pass if you are not sure about your itinerary. The pass will give you the flexibility to change your plans at will. There are two types of passes, Flexipass and Consecutive Pass.
Consecutive passes provide unlimited rail travel every day for the duration of the pass. This is ideal for anyone who expects to move around a lot and travel by train each day.
A Flexipass is valid for a specific number of travel days within a longer period (e.g. 3 days within one month), so it gives you more flexibility to choose the specific days when you want to travel by rail.