Southbound Bernina Express from Chur to Tirano. Do you have to change trains along the way?

Hi, My wife and I are intending to take the Bernina Express from Chur to Tarino on either the 7th or 8th of June and from my investigation of timetables it would appear that the train going south requires me to change trains at two points. Is this right or am I looking at the wrong train? The stops are samedan and pontresina and they include platform changes, but on the same day northbound (our return journey) the timetable does not indicate there are no train or platform changes changes. Please help.
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