alt Hacker NewsFor France, Spain, and Italy, only the inter-country and the high speed rails (TGV, Renfe, Iryo, Frecciarossa etc) require reservation?
In Switzerland, some of the touristy intra-country routes (ex: Tirano-Chur, Interlaken-Lucerne) may require (a rather expensive) reservation.
For Switzerland, that's only true for the special tourist train panoramic carriages on the route, there are normal trains running on the same routes, too, that don't require reservations.