Hi, planning on a number of trains while going into, throughout and out of Switzerland, including Paris to Murren/Interlaken, Murren to Jungfaujoch and other mountains, Murren to Montreux, Montreux to Zermatt, Glacier Express to St. Moritz and Lucerne to Frankfurt. I haven't taken trains in Switzerland so I'm not sure if the difference between the two classes is worth it or not.
Any advice? Thanks.