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http://www.viaggiatreno.it/infomobilita/index.jsp?treno=9420&origine=S09218 Link to Viaggiatteno. Use the journey planner

https://www.trenitalia.com/content/dam/tcom/allegati/trenitalia_2014/informazioni/TABELLA_A_Treni_garantiti_DPLH.pdf

If you go to the trenitalia website there is a list of guaranteed services during strikes. If you then use the Viaggia Treno site you can plan your journey . Cross reference the options to see if any are on the guaranteed list . We are flying from Florence and can get the 9420 train from Napoli...