Last time I took the train (I had some business in, of all places, San Marino and took the train from Rimini to Milano and then to Switzerland where I had some business in Lausanne) I was disappointed.
Well, my connection in Milano was too late to get me a couchette or similar so I spread myself out alone in a 2nd class compartment (this was 1999 or thereabouts, do they still have compartments?) and fell asleep.
We got to the border and first an Italian border guard came in and asked for my papers. I gave him my ID card which (like, some 15 years later, a Romanian airport inspector) looked at with obvious suspicion, running his fingernails along its ridges, etc. etc. Then the Swiss guard came in, only he had a dog. The ID card posed no problem for him, after all he had one himself I suppose. But he wanted to see inside my suitcase, which he was welcome to do even though the suitcase was far too small to hide an asylum seeker. And then he had the dog sniff inside it. (It wasn't even a suitcase: just an overnight bag.)
I now understand why the Milano night express is subject to "special treatment". It's a favorite of asylum seekers I read somewhere, but doing a search engine query on <asylum seekers Domodossola Switzerland> doesn't yield very much.
Fortunately nobody asked me to speak Italian because I would have answered in Spanish and then, for sure, they would have taken me for an illegal, whatever papers I had.
Anyway, have you ever tried to get from Lausanne to Aosta by train? Milano yes, Aosta no. Even Campione d'Italia is easier. Domodossola has always only been a word on a map for me, but that's where I had to change trains. To get to a place (Campione) that turned out to be quite a disappointment, surely a haven for tax avoiders and gamblers; not an ideal destination for ramblers. And nobody could tell me what I wanted most to know: what went on there during WW II.