Travelling by train is a great experience it is fast, easy, cheap when you travel with a day pass.
In addition you can enjoy the great natur views on the way, which is not possible when you driv a car. Here a few shots from train between Thun to Zweisimmen.
Another advantage of train travel is that you can bring your own food and drinks. However, if you are hungry for a hot snack, you can find something delicious in the train restaurant, but a little more expensive.
Have a Great day!