For 7 days in Switzerland, Rick Steves recommends Bern, Lausanne and then Luzerne for 3-4 days, and then moving down to the Berner Oberland for another 3-4 days. I presume you negotiate those Swiss larger cities and then the Alpine region of the BO by various trains. Is that a reasonable assumption, eh., travel first from Zurich to Luzerne, Bern and Lausanne, etc?
But then once done in the BO, is there a train to take us from the BO region straight down to the northern Italian area of the Lakes, Milan, etc?
TIA.