Apr 13, 2015 - 6:15 PM
Welcome fo MySwissalps, Sushmita75! Let's take a look at your questions. A trip from Montreux to Gstaad takes about 1h30, so you would certainly manage to visit Gstaad and return to Montreux the same day. Traveling times can be found through the timetable.
You can make this trip with a Golden Pass train. Your Swiss Travel Pass covers the ride, but you may need separate seat reservations. Please check the Golden Pass page for details. You can travel by regular trains too; they cover the same route as the Golden Pass trains.
The Cailler Chocolate Factory in Broc and the Cheese Factory in Gruyères are very close to each other and can be combined within one day trip. Both can easily be reached by train from Montreux in about 1h15 to 1h30. Enter 'Broc-Frabrique' as your destination in the timetable for the chocolate factory and 'Gruyères' for the cheese factory.
I hope this helps you plan your stay in Montreux!