Rome has intercity train travels.
Train FR5 runs from Civitavecchia i.e. Rome’s cruise port. Trastevere is a station where one changes to Fiumicino airport. Ostiense is also an interchange station to Rome Metro that will take you to Colosseum.
FR1 is a train from Airport to Stazione Terminal which is cheaper than the Leonardo Express.
There are many trains from Rome which link to other cities of Italy as well. There are 3 kinds of trains:-
Frecciarossa trains are high-speed trains and charge double the fare of normal trains. Intercity trains are normal trains with stoppage at major towns.
Regional trains are the slowest trains and are relatively basic in price.