For these holidays, is active the Alleghe Link service, born from the collaboration between Trenitalia and Dolomitibus. The service offers a discount on the price of transport, which can be purchased from all Trenitalia sales channels by typing in your point of departure and arrival (Arabba). The Trenitalia service will bring you to the Belluno station, from where you can pick the Dolomitibus bus, which will drive you to the central square in Arabba in about 2 hours. For all the information on this service, consult the Alleghe Link
portal on the Trenitalia website.