Hi i will be heading to Grindelwald in December 2016 From Zurich Airport. I'm aware that i can get tickets from Zurich airport to Bern, Bern to Interlaken, Interlaken to Grindelwald. My question is am i able to take my luggages up with me on the train? or is it compulsory to purchase the door to door flight luggage service? It is quite confusing.. I hope someone can explain it to me. thanks!