OK, since the phone number for trains in Naples is never answered, I called another hotel, the Grand Hotel La Favorite, another 5 star hotel in Sorrento, and the concierge said she had no idea. She put me on hold, made a few phone calls, then got back on the line with me and told me that it is working now, they have three trains per day at this time. Really, this is how Italy works, it's a different mindset.