I have been looking for tickets from Venice to Tirano to catch the Bernina Express to Chur. When I was looking online for possible routes, I found people recommending taking a train from Venice - Milan and then from Milan to Tirano. While I can find trains between Venice - Milan, I am not able to find any train between Milan - Tirano.
I've already tried sbb.ch. This website provide a link to a train, but when I attempt to buy, it says, the tickets cannot be purchased.
But no luck so far.
Can you please recommend a site where I can book tickets from Milan to Tirano?