Want to get from Obertraun to Bolzano Italy then to Milan help
Train schedules at www.bahn.com. Obertraun to Attnang-Puchheim to Innsbruck to Bolzano.
Use this page instead of the one linked below. With that link you will get "here" eventually. Might as well start here.
Either way, you will go from Innsbruck over Brenner Pass (Brennero) to Bolzano.
The fastest way from Hallstatt to Innsbruck is back via Attnang-Puchheim and Salzburg, but the route through Stainach-Irdning is perhaps more scenic (I did it in 2009).