Feb 18, 2017 - 3:57 PM
You'd best consult the timetable to find such information. Montreux is closer to the vineyards, and it's starting point for both the Chocolate Train as well as the Golden Pass train.
I'm not sure if I understand your question about visiting Bern from Grindelwald (I assume that's what you mean with Grimewald?). You can either visit Bern on the way between Montreux/Geneva and Grindelwald (in that case you won't be using the Golden Pass line) or as a separate day trip from Grindelwald. The timetable I mentioned provides all details.
I hope this helps!