Klosters is reached by road year-round, up the Prättigau from Landquart, and it is one of the easier alpine destinations for exactly that reason: there is no pass between it and the motorway.
What sits at Klosters is the Vereina car train, which loads at Selfranga and runs through to the Engadin. It is not needed to reach Klosters itself, but it is the reason a Klosters transfer sometimes turns into an Engadin one, and it is worth knowing the loading times before the day rather than at the ramp.
