Especially thanks to kybourbon for yr good link, it's very useful,we can use it for next booking.
And especially thanks to zeppole for yr concern,California is one of our favourite places, will definitely go back in the future.

So thanks everybody,with a site like this, we're sure to have happy travel in Italy.

I see you're all still at it. What a delightful exchange---quite entertaining. I now consider you the Unofficial Ambassadors of the Italian Train System for Foreigners.

train seat numbers can be misleading - some sides may have odd numbers only - opposite even numbers. Anyway you have seats that are near each other even if you did not now know that.