Grumo Nevano to Viterbo 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 Frattamaggiore-Grumo and arrive at Viterbo Porta Fiorentina every about 2 hours on average. If travelling with Trenitalia, you need to know the Grumo Nevano to Viterbo train schedule: the first train leaves at 05:32, while the last ride is at 18:15. A Grumo Nevano to Viterbo train cost about 18.5 €. But how long is the train ride from Grumo Nevano to Viterbo? Your journey takes about 5 hours on average.