Yes, you can absolutely bring suitcases on Trenitalia trains, and as of 2026, there are generally no strict weight limits for standard passenger luggage. The primary rule is that you must be able to carry, lift, and store your own bags without assistance from staff. On high-speed Frecciarossa and Frecciargento trains, large suitcases should be stored in the designated racks at the ends of each carriage or in the spaces between back-to-back seats. Smaller bags and "cabin-sized" suitcases can usually fit in the overhead racks above your seat. For those traveling on "Smart" or "Economy" fares on some regional or high-speed competitors like Italo, there may be size restrictions (typically around 75 x 53 x 30 cm), but Trenitalia remains very flexible. It is a "pro-tip" to always label your bags with your contact information and avoid blocking the aisles or doors, as conductors may ask you to move bags that pose a safety hazard. If you have exceptionally large items like a bicycle or a musical instrument, they must be in a case and may have specific size limits (usually under 130 cm).