TGV® France-Italy high-speed trains connect Paris to Milan and Turin every day, while Thello overnight trains will take you from the City of Light to Milan or Venice. Thello also offers daytime trains which run on the Marseille-Milan line via Genoa (among others).
Frecciarossa, Frecciabianca and Frecciargento high-speed trains operated by Trenitalia provide daily domestic trains in Italy.
Choose the One Country Pass and travel around Italy by train to your heart's content.
The Interrail Global Pass is the only travel pass that lets you travel round 30 European countries – to your heart's content.