swiss railpass question

You need to look at the validity map that comes with your Swiss pass (click here for online copy).
Work out your route from where you will be in Switzerland to Milan (use www.sbb.ch ), then work out the last Swiss Railways station on that route. Your pass will be valid up to that point, and you will need to buy a ticket from that station to Milan and back again (use www.trenitalia.com ). Depending on route, that will be Domodossola, Chiasso or Tirano.

But, I would question whether Milan is worth a day trip, unless you have a lot of days to spare. From anywhere north of the Alps (Lausanne, Berner Oberland, Luzern etc.) it is a long day trip. But you do get good views of the Alps en route. I would suggest Lugano or Stresa as better places for a day trip.

You need to look at the validity map that comes with your Swiss pass
(click here for online copy). Work out your route from where you will
be in Switzerland to Milan (use www.sbb.ch ), then work out the last
Swiss Railways station on that route.

Actually if memory serves me correctly, it is the last station at which the train stops in Switzerland.

Jim, Yes, that is what I meant by "last station". If you have two tickets (A to B and B to C), then this is only valid if the train stops at 'B'.
For my local "abo" it says on the map at all stops.
"In den Zügen der SBB, die über die Grenze des Verbund-gebietes hinausfahren, sind Verbundfahrausweise bis zum letzten Halt innerhalb des Verbundgebietes gültig.
In Zügen, die planmässig erst ausserhalb des Verbund-gebietes wieder anhalten, sind Verbundfahrausweise nicht gültig."
If I am going to (for example) Zürich. I need to work out the last stop for whatever train I am getting, and get a ticket from there. Which means if it is a non-stop train it costs more!

chungfani, If you are heading for Italy, AFAIK all trains stop at the Swiss / Italian chnageover station, and usually change crews there. The "new" ticket inspector then checks all tickets.
For Italy, the changeover stations are: Domodossola, Luino, Chiasso or Tirano. At Tirano you always have to change trains. I don't know which route you will be taking as you don't say where in Switzerland you are starting from.

Hi folks. Thanks for the assistance.
We intend to go to Milan from Luzern on a Sunday in September.