Carmagnola to Monterotondo trains might be a good value for money solution: travelling in Italy by train is often rather cheap and faster than taking a bus indeed Trains leave from Carmagnola and arrive at Monterotondo-Mentana every 60 minutes on average. If travelling with Trenitalia, you need to know the Carmagnola to Monterotondo train schedule: the first train leaves at 05:10, while the last ride is at 15:10. A Carmagnola to Monterotondo train cost about 99.2 €. But how long is the train ride from Carmagnola to Monterotondo? Your journey takes about 6 hours on average.