I have a train travel booked through Germany, Switzerland and Italy. All three legs of the travel are booked through bahn.de, and the Germany into Switzerland leg I can find back on the system of that site. I have asked a question and they will (or at least should) get back to me on that.
The other two legs, (one from Basel to Milan, the other from Milan to Naples,) are booked by bahn.de on Trenitalia, and the German site does not recognize the PNR number for the booking.
In most cases I would not bother to try to cancel/get a refund as they are super economy tickets which do not allow refunds, but with the health situation in Northern Italy, I want to try to get a partial or full refund, (just like I would get from the airlines if they have to cancel flight.)
I hope someone is able to tell me how to ask for the (partial) refund or whether it is better to wait till almost the day of travel. The date on the ticket is 18th of March, 2020.