Mar 31, 2016 - 6:40 AM
As Slowpoke tell you, you can view the platform and other details of your trip click on the button "+" details and you can view the train stain map with the link.
Normally the changes are four or five minutes, that it's enought time. In your case, depend if the train to Gstaad is a regular train or a GoldenPass train.
In my experience, (I arrived with GoldenPass to Montreux and I changed to Geneve that it was in platform 1), may be it's a short time to do the change if you travel with baggage.