We flew into Zurich and caught the train (the clever Swiss have their train station located one floor below the airport and since our luggage had been sent through to Kandersteg it was a simple procedure) to Bern.
Once in Bern we transferred to another train. Here was our only almost mistake. It starts as one train but then divides on the route. We were in the wrong section to get to our destination. The conductor helped us get to the correct car and we never made the mistake again.