The most popular routes from the Italian capital are: the
Venice to Florence train (rail trip duration: 1 hour 20 minutes); the Rome to Venice train (3 hours 35 minutes on the road); the Rome to Naples train (54 minutes!); and the Rome to Milan train (travel time: 3 hours).
Domestic routes which are in demand from the romantic Italian city of canals are: the
Venice to Florence train (approximately 2 hours) as well as the Venice to Rome train (3 hours 35 minutes).
As for the world’s fashion capital, the
Milan to Venice train (2 hours 50 minutes ride) and Milan to Florence train (1 hour 45 minutes) are among the main ones that are in favor of travelers.
Finally, the Italy train routes from the beautiful Tuscany Renaissance city are the
Florence to Milan train (travel time: 1 hour 45 minutes) and the Florence to Venice train (about 2 hours).
What's for the rail routes of the Italian islands, unfortunately, there are very few of them. As such, Sicily doesn’t have high-speed trains at all yet as the island is very hilly, but you can reach, say, Palermo from Cefalu, on regular trains.