I am interested in Regionale 25521 Lugano (12:42 *) - Milano Centrale (13:50) on 31 May. The SBB site lists this train, but Trenitalia lists it as N.A. and ItaliaRail does not list a train at this time at all. I do not want to purchase the tickets from SBB if this train will not be running that day. Can you please clarify?