The biggest difference between the regular Circumvesuviana trains and the Campania Express trains are that the latter are specifically designed for tourists and offer air conditioning, guaranteed seating, and luggage storage.

The primary difference between the two lies in speed, comfort, and cost for the route between Naples, Pompeii, and Sorrento. The Circumvesuviana is the standard regional commuter train; it is very inexpensive (around €4–€5), runs frequently (every 30 minutes), but lacks air conditioning, has no reserved seating, and stops at all 35 stations, making it crowded and slow. In contrast, the Campania Express is a special tourist-oriented service that runs seasonally (typically March to October). It costs significantly more (around €15 one-way) but offers modern, air-conditioned carriages, dedicated luggage space, and reserved seating. Crucially, it only stops at major tourist hubs like Ercolano (Herculaneum), Pompeii Scavi, and Sorrento, reducing the travel time and providing a much more relaxed environment. While the Circumvesuviana is the "authentic" local experience often fraught with heat and pickpockets, the Campania Express is a premium "express" alternative designed specifically for travelers with suitcases who want a direct and comfortable connection to the archaeological sites and the coast.