High-speed trains in Italy, such as Frecciarossa, Frecciargento, and Frecciabianca, are faster and more expensive than regional trains, but offer more amenities such as comfortable seating, air conditioning, and sometimes a dining car. Regional trains are slower, make more stops, and are generally cheaper than high-speed trains. They often have basic seating with no reservations required, making them a more flexible option for shorter journeys.