I'm posting this more as a For Your Information advice, since it concerns a popular route. If you are making plans to travel between Milano (or Varenna) and Tirano, usually in combination with a trip on the Bernina Express, for some reason these trains are not showing on the normal queries used by Helpliners (DB/Bahn website, Trenitalia website etc). These sites are just not recognizing this important-ish rail line. However, I've got good news: train are running as always, usually on a bi-hourly frequency, and information about schedule can be found on TreNord (the railway joint-venture that operates it) website!
This is TreNord link for searching its trains http://www.trenord.it/it/servizi/motore-orario.aspx And this is the direct PDF with the current timetable of trains on the line to Tirano http://www.trenord.it/media/557100/q_mxp.pdf
Andre, this is not new. Bahn.de has not shown them for a long time. The eSwiss rail site does show them.
Andre L, That's been the situation for awhile with the bahn.de and Trenitalia websites. Varenna-Esino doesn't even show up on either site. When checking train details on that route, I've resorted to using the sbb.ch. website, as it's always been reliable. Cheers!
That is indeed strange.